I highly recommend sticking to MTT's and running 3-4 at the same time. I would pick a few tournaments that start close to each other, that are probably between $3-$6 entry fee each, and join a few of them. Having more than one going at once will keep you sharp and typically will keep you safe. You won't have time to make the typical idiot, "why the heck did I call that" decision this way.

Just my two cents. Good luck!