Very good info so far.
That's fine if you want to try it, but you still need to know how to eat on those five days. This is a good start: https://www.t-nation.com/diet-fat-loss/simple-diet-for-athletes
I think the plan Lift was mentioning was my often-suggested bodyweight routine. It's a way to build a base level of strength, coordination, and simple muscular conditioning. You could jump right into a well-designed weight training routine, but it wouldn't hurt to try this for a week or three, if only to see where you are.
Mon, Wed, and Fri
A) Squat 2x12-15
B) Push-Up 2x12-15
C) Alternating Lunge 2x12-15 per leg
D) Neutral-Grip Pull-Up or Horizontal Row 2x12-15
E) Plank 2x15-count
F) Burpee 2x15
Sure, it wouldn't be a bad idea, especially if you're "20% bodyfat" which means you're definitely carrying some extra weight around. The burpees in the above routine are a very brief sample of "cardio". Simply walking is a straight-forward way to get your cardio in, but it can take a while. https://www.t-nation.com/training/get-ripped-get-walking
Jump rope and treadmill work (especially incline treadmill walking) are other good options.
After you build a base, complexes are another great way to go (basically doing 4, 5, or 6 free weight exercises in a row, almost like a circuit.) There have been a ton of articles about them, but I wouldn't say they're the best bet for beginners.
Other than a protein and carb drink when you lift, supplements can pretty much wait. Get your training and nutrition in order first.