Welcome to the Forum.
If this is your first experience with Jims programs, I would do this:
Original 5/3/1 for some cycles.
Do it like this:
Pick the TM wisely. Try 85% of your PR’s, that could be the weight you get a good strong 5 reps with.
Then do the main lift doing Rep PR’s, stop 1 or 2 reps short of failure.
For the first 2 cycles do FSL (First set last) 3 sets of 5.
YES for the first cycles this is feeling light. It doesn’t matter. Put the effort in that one top set.
It’s now time for assistance.
You do about 50 reps of each category.
That is push - pull - core.
example 50 pushups, 50 chins and 50 lunges OR
50 DB bench press, 50 DB rows and 50 hanging leg raises.
It dosen’t really matter it is that one top set that is what matters.
You asked for 2 programs either 5’s pro or hardgainer,
Well at the moment 5’s pro with 3-5 set of FSL is not the worst thing to do.
But learn the principles, start too light, remember the jumps and throws, mobility and some kind of cardio.
Lifting is a life long experience.
Good luck and once again welcome.