Just for your information, you cannot 'turn' anything but muscle into muscle. So if you are thinking you will eat, get fat, then turn that into muscle, it doesnt work like that.
There is a TON of information on this board regarding clean eating, eating for bulking, eating for cutting, hard gainers... and so on.
If you do not want to take the time to read through all of that, may I suggest you hire a coach who will walk you through it.
If you have intentions of being a competitive bodybuilder, then by all means, I strongly suggest hiring a coach. They will teach you how to do it right from the start.
Shelby Starnes and John Meadows are just two off the top of my head, but if you look around and read a bit, you probably could find more.
Also, learn to use the search function and check out the beginners section. Many of your questions have probably already been answered there.
As for anabolics, stay away from those until you need them. That's my advice.
Good luck whatever you decide.