It depends on the exercises. For squats and deadlifts, I would stay 5 reps or below. For RDLs and good mornings I like the 4-6 rep range and the same thing for GHRs. For things like back extensions, single-leg squats, step-ups and lunges, I like the 8-12 rep range.
I like to eat a medium-sized, moderate-carb meal with plenty of protein and not that much fat about 1-2 hours beforehand. I start sipping Surge after my first work set and usually finish 1/2 - 2/3 of it before I'm done and finish the rest as I'm cooling down or doing whatever prehab work I'm doing that day. About an hour later I eat a meal with some protein and plenty of carbs.
Yeah I think that's basically true, you should have plenty of fast carbs post-workout. Aim for a 2:1 - 4:1 ration of carbs:protein. I really like Surge for this, the taste is pretty good, ingredients are quality, it has a good ratio of protein:carbs and it also has BCAA's which are important as well.
I'm not sure who told you this. You NEED sugar (or fast carbs) post-workout to start the recovery process as fast as possible. I wouldn't want to ingest sugar way before you workout (1-2 hours) though. Durning your workout I think is good.