Welcome to the BB universe! And it's always nice to have another lady joining us. [/Chatting up mode]
No, seriously...
For the rules of the game, if you're ready to handle the 27 volume rulebook (just kidding

), download "The Living Rule Book" at
www.bloodbowl.com
The first 15 pages (with lots of large pictures etc., so it's not long to read and get acquainted with the contents) are made to teach you the basics of the game. The rest will just come along.
At the end of the rulebook, you will see the various races listed. Looks definitely confusing for someone who starts. It was for me.
There are two ways you can approach the game in my opinion:
1- You try to play it "seriously", i.e. you follow Slup's advice and take forgiving teams to see how it feels like to try to handle the ball and score, do a few blocks around to support your game etc.
2- You just fool around (that's how I started 7 years ago) just to understand the basic rule mechanics. In that case, a team with much uniformity may be more appropriate, i.e. with players not to so different from one another - I'd think chaos, norse (just don't pick the player called the "blitzer/berserker" or it may make things harder), or even dwarves. After a couple of games like that, you'll understand more how the game works, and you could this time try to focus on winning (although many coaches still don't care about winning after many years of play...

).
Teams I'd recommend you to avoid early in terms of "winning potential":
- goblins and halflings: they are the "little guys", as reflected in their low strength and price. They have just been designed for fun play, not competitive play. Moreover, they rely on the support of a particular form of extra player (i.e. not in the basic teamsheet) called the big guy (troll, treeman, as well as ogre and minotaur, although the little guys cannot buy these two), who can toss his small team mates at the other end of the pitch. I suggest you wait before taking this on.
- khemri: agility 2 is really bad for every ball handling job. Yes the players are strong, but they can't properly handle the ball and are slow, so again, this team is probably more for fun play.
- ogres and vampires: both are very different, but they are victims of "negative traits" that add a substantial amount of randomness over the control you have over those guys. Again, they are more fun-play than competitive teams.
For more help, don't hesitate to check out the "Skills and Rules" and "Tactics and Team Development" section - they are already a lot of good posts. Use the search tool on top of the screen to help you find the appropriate thread. Also, don't hesitate to ask any questions in those sections as well...
Good luck!