Welcome back indeed. I had a about a 4 year layoff years ago and when I came back after a buddy opened a gym in my neighborhood, I was all ready to show the guys what it was all about. So we go in and i load the bench with a modest warm up weight (135). My friends are like whoa...maybe that's a bit too much to start. I'm like nah I used to warm up with this easy. So I lay down on the bench, lift it off and FUCK..I could not squeeze out 10 measly reps! And of course the guys give me that "I told ya so" look.
Ok..now to my point. Just try not to do too much too soon. Tack on via tiny increments of weight and volume. And I honestly wouldn't even bother with all those supps right now. You're not going to be taxing your body that much to start off with so I'd save them for when your workouts start becoming more challenging and are in need of enhanced recovery. That's my 2 cents. Good luck.