Don't sweat it too much. Too much pre studying can mean that you learn the wrong info or techniques. There's a reason why they teach you in indoc. Once you get your books, thats that time to learn and study. If you find out what plane you're going into, try to get a copy of the company limitations for that aircraft. Learn those and the memory items and you'll do fine.
In the mean time, start off by increasing your daily intake of cheap foods, such as rice and ramen noodles (the generic kind). Cuz, unfortunately that's what you'll most likely be eating for the next year or so on FO starting pay...