Hello and welcome to gtplanet.
If advice is what you're looking for the best I could give you is watch the example and take notes on where the example breaks, accelerates, and how it steers. Also it helped me to turn the driving line on to give me a Bering on when to brake, steer, and find the correct apex of the corners and whatnot.
If you have any other questions just ask and I'll try to help the best I can ok.