Been hitting the weights for like about two years when i came off the drugs.
Like you said, i try to stick to one muscle group a day then wait a week before i work it again, but if the muscle is stiff after a few days i'll stretch it out and work it a bit but not too much.
I did use creatine for a while, but it's a pain for me to use because of the loading phase, sometimes i just don't have the time so i stopped that. I'm naturally slim, like a junkie, so to get big i had to lift heavy. Chunky guys can get away with lots of reps on moderate weights, i had to do low reps (about 😎 with heavier weights.
All i use are protein shakes for immediately after the workout, then i have 5g of L-glutamine powder before bed to stop your muscle wasting in your sleep. That's it! Apart from like about a gallon of water everyday.
There's todays lesson in looking buff, carry on!