You don't really need to read ahead if you just commit to it when the class starts. The whole "hype" about organic being the hardest class ever is from pre-med majors that don't enjoy (or are good at) chemistry. The fact that you took the time to go online ask this leads me to believe you have a lot of drive to do well in which case you likely will.
Anyways, if you're that interested, try to get a copy of your professor's syllabus and go through some of his suggested problems. Different teachers emphasize different things. The first few chapters are not that difficult (basic molecular structure, acid base reactions, etc). I would maybe try and read up on the nomenclature since most teachers make you teach this to yourself which can be time consuming, basic conformational analysis (and conformations in relation to stability), and stereochemistry.