Something this general would belong in the beginners sticky thread at the top of this subforum; you could however post some example hands with all relevant stats in a new thread asking about sizing in specific spots . As leakssuck said, it depends on a lot of factors (villain, flop texture, spr, etc)
There was just a good thread about cbet sizing in the husng forum recently iirc, but I can't seem to find it. If I do, I'll add the link
Edit: Meh not the thread I was thinking of, but there is some good content in here
http://forumserver.twoplustwo.com/18...stion-1400706/