There are tons of good threads and library articles on the forum that can give you many details. For a quick list, you can read the articles on rabbitcare.org:
http://rabbitcare.org/article-index.htm <-- Many good things for first time bunny owners to be aware of, because it's not always obvious!
Be aware that if you will be caging your rabbit, make sure the cage is an appropriate size. At a minimum, the rabbit's litter box should fit and there should be room left over for the rabbit to lay down and stretch out comfortably without sitting in its own wastes. Make sure you let your bunny out for exercise time so it's not too bored in its cage 24/7! It is important to let them exercise otherwise their muscles will weaken and it won't make for a happy rabbit
Rabbit proof any areas that the bunny will be running around in. That means protecting exposed cables, power cords, computer wires, computer mice, keyboards, headphones, etc., homework, important papers, and such stuff you don't want you rabbit to "autograph"
I feed my bunnies twice a day. They get pellets and freshly washed greens vegetables at that time. Several times a day I will make sure my bunnies have clean hay to chomp on. Some people can check on the level of hay available once a day or so, but mine just eat so much that I have to check at least twice a day. For a list of rabbit-safe veggies and portioning you can read up on rabbit.org.
Fiber is probably the most important part of a bun's diet so you should find out where you're going to get hay for the bunny to eat. A bun who eats lots of hay is going to be a much healthier bun than a bun who doesn't.
I clean my bunnies' litter boxes every 3 days or so and I also use wood pellets as litter. I spot clean the rabbit areas each night so that there's not too much clutter or loose hay or poop on the ground.