I would recommend seeing if you can take a watercolor course somewhere. A lot of community centers offer art classes. If that fails, look for videos on youtube, I'm sure they have tons. Water color takes a lot of time and practice to work with as they behave very, very differently and unpredictably to everything else. The best thing you can do is to sit down and do a bunch of quick doodles and sketches and just play with the watercolors. See what different effects you can get with different strokes and wetness, adding water first and then paint, vice versa. It's a weird medium to work with!
Also, never buy the cheap watercolors! If you're serious about working with this medium, at least get the 'middle of the road' cost paints. The cheap ones don't blend well at all and colors are bland at best, making it hard to mix colors. They tend to get muddy, and good watercolors you can lift right off of good quality paper with water. It's pretty neat! Anyway, the good quality paints work so much better and really do save a lot of frustration when painting with them, so they're worth it!
EDIT: Here's an example from my old DA account of what I mean by 'play' with them
http://browse.deviantart.com/?qh=§ion=&q=dinosaur+roar+watercolor#/d2g66rz We did this in a design class, jsut had a play day; did a quick little doodle, then painted it up. It also illustrates why I don't recommend the cheapo paints, they're a pain to work with and the pigment in them is terribad! Blendable, but they tend to muddy quickly.
~~Brunn~~