You're way overcomplicating it, and all this crap about supplements and all that crap is BS. You don't need it and you never did. If you have to get juiced or dump a bunch of supplements to get a workout in, you're doing it wrong. It's a crutch. You can't buy yourself into fitness.
Weights: full body, start lightweight, but get three sets of 10 reps of all the muscle groups. Three days a week, one day apart. Starting heavy, or jumping into heavy lifting, is only going to injure you.
Cardio: target heart rate not to exceed 150, start with what you can do, even if that's walking 10 steps. Three days a week, one day apart, on the days you aren't doing weights. Goal here is to get to at least 30 minutes keeping your heart rate at 150, and it if exceeds 150, SLOW DOWN.
This leaves you one day a week to fully recover, and you're going six days a week but cardio and weights each get a day off all week long.
Start light and easy. I literally started with 5 pound weights and walking one lap of the track. I ended up outlifting everyone in the gym and running two miles under 8 minutes a piece.
The key: you have only one goal: do better than you did the day prior. You did 20 minutes on the elliptical? Next time, you maybe do 20 minutes, 30 seconds. Maybe you increase the resistance 1%. Maybe you do twenty minutes but jump on a bike for 2 minutes after.
Maybe you bench 10 reps 3 times, next time you 11-10-10. Maybe you're hitting 12-12-12, so you bump the weight 5 pounds and reset to 10-10-10.
If you feel beat after the gym, you're taking on too much, when you should feel elated, fulfilled, and relaxed after the gym. The goal is to do better than you did last time. That's all, and it's a goal you can achieve every. single. time. Unrealistic goals are what kill most people trying to gym up.