After getting back to hitting the gym pretty heavily the past 2-3 months, I am finally feeling like I am back on track to meeting some fitness goals I had fallen back on (getting to ~15% body fat, along with some weight goals and getting down to a 32" waist).  I had gotten lazy and started eating poorly again so this renewed progress pleases me.  

Now for the questions..

1)  Is there anything wrong with mixing up different muscle group workouts on different days ?  Sometimes, due to either time constraints or the fact that someone else is using a piece of equipment I can't finish a muscle workout, so if there are a set of three exercises Im doing for Triceps, are there any negative repercussions to doing two of these on a monday and finishing the third up on a Wednesday?  Or even spreading leg workouts out over the week so that each time I am in the gym I incorporate some kind of leg exercise in with each session.  Asking as I typically see people talking about working on specific muscle groups at each visit.

2) If/when I reach my final goals, and making progress is no longer what I am trying to accomplish, will I still need to workout as hard to maintain where I am at?  Or can I back off ? (assuming I don't get too lazy and too stupid with regards to eating habits).

3) gloves...I see a few people wearing these in the gym...useful or no?

1.  No, as long as you are getting enough recovery time.  I am not a fan of doing a lot of accessory work (like dedicated triceps exercises), but do what works best for you.  Compound lifts help me get the best result for my effort.  

2.  Yes; it is a lifestyle change, not an event.  Keep hitting it hard.  

3.  Some do.  I do not.  While my wife does not like lifting calluses on my hands, I find them useful while working and lifting stuff outside the gym.

1. Go find an actual program strong lifts 5x5 or starting strength or 531. Do that program.

2. Yes keep up on working out.

I don't like gloves. That is likely to mean they are not gripping the bar right.

I bought the starting strength book..no way Im reading all that lol...I'll look into those others.  Generally what I've been doing is looking up workouts on the internet, finding one, and doing that for 6 months or so and than switching..current one is this:

https://www.bodybuilding.com/fun/diesel-power.html

and I've been splitting those exercise up over a 4-5 day period...essentially in the gym every morning M-F.  I think I'm getting enough recovery, but regardless I pretty much need to be in there every morning to help deal with stress...

You don't need to read the ss book to do the program.

With regard to your first question, there's a lot to be said for increasing intensity and frequency and decreasing per-session volume. Basically, lift heavy, hit the group 2-3 times a week, but don't do like 20 sets. Mike Israetel has some good videos about how the "bro split" (i.e. hitting a body part once a week with crazy volume) leaves a lot of gains on the table due to the limited window of growth and recovery.

Heading into winter this is basically my plan. Decent frequency, adequate recovery, just the basics.

Mon/Thurs - Squat, Deadlift, BB Hack Squat, GHR. Alternating heavy and light days for squat and deadlift.

Tues/Fri - Bench, BB Row, Chinup, OHP. Alternating heavy and light for both Bench/Row and Chinup/OHP

I need to eat and get stronger after a hard summer, then I can mess around with some PPL or something heading into spring.

48 sets on day one. I would get sick of that pretty fast.

Just from personal experience since you said you are wanting to lose weight while lifting, do not do higher volume.  Lift as heavy as possible for 3 sets.

I did much better strength-wise when I did this vs. high volume.  Something like a 3x5 scheme instead of 5x5.

Just remember, this is personal experience, ymmv.  

I find gloves useful to:

- prevent calluses
- provide cushioning for my hands when doing dips

lol...yeah..i've been splitting it up over 4-5 days.  I am seeing results though so thats a good thing..

I'll check out 3x5 or 5x5.

so this 5x5 program ?  https://stronglifts.com/5x5/

1. Find a workout program you enjoy and can be consistent with that suits your schedule.
2. Once you achieve your goals you can maintain a lot easier. It only takes around 8 sets per week to maintain muscle size. (Per Dr Mike Israetel).
3. I like gloves because I don't like callouses. I don't like my hands being super rough and them peeling. I tend to grab weights in a way that pinches the skin causing said callouses to form.