First things first and I've said this before, stay away from the bloody FOX as a beginner. Most new comers jump straight into it and never progress any further, purely because the thing is so easy to drive and be competitive in. Id always recommend starting with the heavier road going cars to get a feel for the sim, then after a while move onto something faster (GTR/LX4-6) and take it from there.
If however you want to stick with driving the FOX then the only thing I can recommend is go as fast as you can, whenever you can, wherever you can. If you screw up then get going and and keep pushing, you'll never learn till you make mistakes and you'll never make mistakes until you bin it
Don't focus too much on how you approach the corner, just think how you want to exit and after a while you'll auto magically find yourself positioned correctly anyway.
Rome wasn't built in a day - So don't expect amazing results just yet, k have fun bye.
Edit: Try following some fast guys, you'll soon pick up their lines.