at first I was a big proprietor of using the various speed alternates and I thought that as cpus walk rather than dashing L-canceling, wavedashing, etc that lightning mode melee might help to simulate games speed at a tourney. However, smashboards has more or less impressed upon me that altering speed is bad because of the different timings. I find that fighting lvl 1 cpus is really only good for practicing impromtu combos (still very important) but theres no mind games and you can't work on your defensive game much. So any other advice would be welcomed from me too.
Theres no subsitute for actually playing people as good or better than you though. I feel the same way mewto64lol. All the smashers at my school are cheap scrubs with no adv. techs at all. I know alot of people are against it but at least with the Brawl you can always find players online to practice. Whos to say they won't be cheap scrubs too.
Best of luck man I feel your pain.