Weight loss comes from diet. Fitness comes from exercise.

The only way to keep the weight coming off is to optimize your daily intake. My Fitness Pal can help with this.

You can also use exercise to convert some fat to muscle.

Fat loss is all about control over what  you put in your body.  Download the MyFitnessPal app and pay the extra $50 to get the pro version.  This will help you monitor your daily macros.  This is the most important thing you can do.  When you have a way to track your macros, you can hold yourself accountable and fat loss becomes easy.  The other nice thing about MyFitnessPal is that it has all the macro values for almost every food you can eat and drink - even restaurant menu items.  You need to set it up properly with your vitals and activity level though.  But you need to track everything you eat and drink.  Get a food scale and weigh/portion all of your food during meal prep.  YOu need to stay on top of this.  I cannot stress this enough.  You should plan each meal the day before and either preportion it, or follow it like a menu as you prepare the meals that day.  Be honest with yourself.  If you aren't then you only cheat yourself.

You should cut out all sugars.  Sugar is horrible for you unless it's used to provide fuel for an immediate workout.  No soda.  No candy.  No sugar.  The only time it's ok is immediately prior to a workout.  You can eat a banana about 30 minutes prior to working out.  This will give you sugar and carbs for fuel.  The other option is to not eat the banana, but start sipping a 16oz Gatorade about 30 minutes into a workout.  Don't do it before because the sugar transfer is too quick with that drink.  But, you should only start drinking the Gatorade if you feel like you need it.  Drink plenty of water.  But, put lemon in it.  Cut up an entire lemon and squeeze it into your water bottle every morning.  More vitamin C than an orange and it cleans toxins out of the liver. 

Mini Fasting every day.  This is super important.  The body needs time to break down and digest the nutrients.  We have conditioned ourselves to eat a lot more than we need.  This constant influx of calories will literally back up the system.  You should eat all of your food for the day within an 8 hour window and fast for 16 hours between your last meal of the previous day and your first meal of the current day.  This is hard at first, but your body will adapt.  It actually goes back to our biology roots.  Think about it - people didn't used to wake up to pop tarts and milk from the fridge.  They needed to get up and hunt / gather their food.  That meant they didn't eat right away.  They would spend all day hunting gathering and working - eating little.  At night, they would feast with the tribe.  The only time you should break the fast early is when you work out in the morning.  Eat a banana 30 minutes prior to the workout for fuel.  After your workout, you should ingest carbs and no more than 25grams of protein.  Your body can actually process only 25g of protein at a time.  Anything beyond that, will actually be treated like a carb.  Believe it or not; carbs are what really help muscle growth when you start building.  Carbs and glutamine.  Protein supplements are nothing but gimmicks.  On days that you don't work out, you should be fasting.  If that means you ate late the night before, then you may not eat your first meal that day until noon. 

Food should be reduced.  Yes, there are times you will be "hangry."  Deal with it.  Don't cheat.  The closer you stick to your plan, the faster your fat loss phase will go.  The two best foods for fat loss are broccoli and asparagus.  They are fat terminators, and should be the source of the majority of your carbs during this phase.  I'm talking 4 cups of broccoli per meal.  your shit will turn green.  But this stuff works.  Fats should come from natural sources.  cook with coconut and extra virgin olive oil.  Cut out the desserts and cheese.  Don't let your cravings control you like a pregnant woman.  Chicken, beef, and fish are good.  Salomon and Perch are excellent.  Eggs and egg whites are great too.  Basically, you should be good as long as you make smart choices and everything fits in your daily planned macros on your MyFitnessPal app.  Smart choice example: yes, you can get some protein and carbs from macaroni and cheese.  But you get better protein and carbs without the processed crap from grilled chicken, wild rice, and broccoli. 

Work out at least 3 times a week.  Work out hard and get a good 20 minutes of actual work in.  20 minutes may take you 40-60 minutes with rests.  But your rests should be 30 seconds max in fat loss.  Exercise should be functional strength training.  Examples:

Day 1
-tire flip (24 reps)
-Pull-up (8-10 reps)
-Push Up (8-10 reps)
-Dips (8-10 reps)
Super set these for 4-5 total sets.

Day 2
-Renegade Row Push-Ups (15 reps)
-Burpies (20 reps)
-Plank (60 seconds)
Super set for 4-5 total sets

Day 3
-Prowler with weighted skid (50 yards)
-Box Jumps (10 Reps)
-Hanging L (12 reps)
-Push-ups (10 reps)
Super set for 4-5 total sets

These are just examples of functional strength training that will keep your heart rate up and burn a lot of fat.  Something you will notice is that they require very little equipment.  Fat loss training involves a ton of varied body weight exercises.  There are tons of plans and you should vary your workouts.  If you can afford it, I'd recommend hiring a 1 on 1 coach who will motivate you.  this is a great way to maintain accountability.  After all, you're paying for it, so you better go.  But, you need to get a trainer who knows what they are doing.  They shouldn't look like they need a trainer themselves.  They should be versed in both fitness and nutrition.  You should do a moderate pace walk for 20 minutes every day.  On the days you are not strength training, you should do 20-40 minutes of HIT on a bike or sprints.

Honestly, if you stick to the plan like a ritual and take it seriously, you should be dropping tons of fat in only 12 weeks.