my very first bunny...ever!

Question
I need to know the basics of taking care of a bunny, for myself and for my 2 children. How to feed, what to feed, how to maintain them, what to do, what not to do. Everything.

Answer
Congrats on your new bun!

There's a lot to learn on rabbits, I'll just hit the highlights and give you some links to some sites where you can read in more detail.

First, diet.  This is a complicated matter because a lot of the food sold in stores isn't healthy for rabbits.  Rabbits need to have a high fiber pellet only feed.  Oxbow is a good brand if you can find it in your area.  But pellets should only be a small part of a rabbit's diet.  Hay and vegetables (if the rabbit is old enough) are vitally important.  For some more info, you can read this post that I wrote on my thoughts on a good diet:
http://itlastsforalways.blogspot.com/2008/06/diet-with-t.html

The next is housing.  You don't have to use a cage, you can use a puppy pen, or use grid storage units to build your own.  The important thing is that your rabbit cage be big enough and that your rabbit gets a lot of exercise.  Here's some more detail on ways to house your rabbit and what kind of things your rabbit needs in a cage:
http://www.rabbit.org/faq/sections/housing.html
http://www.qrabbit.com/housing.html
http://www.ohare.org/vol5_3.htm#pens

The next is rabbit and children.  If your kids are young, you'll need to supervise them for a time.  Rabbits have fragile bodies and don't like being held like dogs and cats.  And some kids need time to learn what rabbits like in terms of interaction with people.
Here's some sites with some info on bunny body language:
http://www.mohrs.org/hrswebpg17.html
http://language.rabbitspeak.com/

If you haven't done so yet, you'll want to take your bun in to a vet for a checkup.  This is more to allow a vet to see your animal in a non-emergency situation.  That way if an emergency arises, you'll already have some place to go and one that has seen your animal at least once.

Also, if your rabbit isn't fixed, you will strongly want to consider it.  Fixed rabbits have less behavioral issues and if you have a male, won't spray.

In terms of what not to do.  It's just a matter of learning about them.  They are not at all like any other animal in terms of their behavior, health, and diet.  They are quite complicated animals.

This just scratches the surface, I'll pass one more link.  This post links to a bunch of other bunny 101 things for you to learn about:
http://itlastsforalways.blogspot.com/2007/08/bunny-101-should-i-really-bring-rab...

good luck with your new bun