The places previously mentioned are great places online, but if you run into trouble, I would check out the nearest Michael's or Hobby Lobby - they sometimes have classes if you find you are having trouble interpreting the videos and need something more hands on (I'm a hands-on girl).
Only negative thing about Ravelry (for all of its goodness) is you usually have to wait a day or two from when you request to join until they let you in. Once in, though, it is a fab site and you should try looking in the forums for other beginners or other people around Round Rock area - I know there's a UT - Austin group, though we don't have much of activity on that forum (mostly looking for the right burnt orange color yarn or talking about the latest football game).
You might also try your closest yarn shop - some of them are eager to teach new "addicts", either one-on-one or in an intro group class; if they aren't, there might be a customer who will be happy to teach you. There's Needlarts of Georgetown in Georgetown itself, and Yarnbow, Gauge Knits and Hill Country Weavers all in Austin (and I think Hill Country Weavers has been around for quite some time). I don't know how close those are for you though.
Good Luck!