I'm not a big fan of all the supps out there, I just stick to WPC and heaps of it. Some would say to add a muti, and some fish oil but I don't bother with those either. As for what you should be eating, well lots of protein, I eat 1.5g for each pound of body weight I want to achieve under all my fat(for me 100kg lean). I eat about 350g of protein a day from meat and WPC, I try to have a balanced diet, that's about it. I did have a very low carb intake to start with, but have found that I wasn't performing in the gym as I wanted to and felt a bit run down after a few months so upped them. It's a very personal thing working out how many cals to consume a day, I seem to get away with heaps of cals as long as I am lifting hard, but pack the fat on if my intensity goes down. You could use one of those calculators that are all over the net to get an idea of starting cals. The one thing I will tell you is to forget trying to cut up on an untrained body, you will just look soft as fuck, you might fit those old jeans but fuck that shit, aim for a slow but steady progression of body recomposition.