You're totally correct. 1lb/wk is great progress, you don't even need to be looking into this stuff yet (AAS or otherwise.) As long as you can keep gaining naturally, do it. When you stall out, try switching up your diet and training. When you stall out again, then maybe look into AAS.
Yes, of course you still have to eat big with AAS. In fact it's pointless to do them if you aren't eating and training right, the benefits would be minimal. How can your body put on muscle when you aren't giving it the raw materials to build with? AAS do not generate growth. They just encourage growth when the right conditions are already there. They're a powerful adjunct, but only an adjunct.