If you go to the SCA website, they have a newcomer page that's helpful.
http://www.sca.org/officers/chatelain/newcomers.html
In the group you're going to visit, you phone their Chatelaine. That's sort of the welcome wagon person who is there just to help new people get oriented! This person should be listed in the Kingdom you're in. If you cannot find it, let me know what city and state/province you're in and I should be able to help.
My persona is a 16th century Welsh bard (entertainer) but I also do the equestrian, am heavily into the Arts and Sciences and over the past 18 years I have fought in every discipline they have. yes, women can fight too!
Let me know if you need any more info, I'm glad to help :)