Be patient! On my first first brew, I decided to take a taste test at like day 3 and it was awful and I thought I ruined it. 3 weeks later it was fine, but still very young. Now I do minimum 2 weeks primary, 2 weeks secondary, 2 weeks bottles. Not a perfect science, just use that as a frame of reference.
And buy the best kit you can afford. If you have a local brew shop, use them. Mine completely rearranged their kit for me because I wanted to do 3 gallon AG batches, not 5 gallon extract. Places like Northern Brewer and Midwest Supplies are great and cheaper, but you don't get the service that a local place will give (hopefully). Also, you don't have to pay shipping and you help out local business, if you're into that kind of thing.
And read!!! A few months ago, I knew the words wort and hops. Now, I could have a 3 hour conversation with a fellow brewer without running out of topics, and I still have only learned the tip of the iceberg.
Welcome to the lifestyle!
P.S. All the stuff the other guys said, too. Sanitize!