Hey Sophie,
Welcome to the wonderful and addictive world of cycling. Because school is out there aren't that many people living in Santa Cruz right now so there aren't that many organized rides going down. Usually we have a team ride on Sunday that is a good way for new people to learn routes and pointers. We also have team meetings a couple times a month that would probably be beneficial to a beginner rider. All rides and meetings get posted here on the forum. You should come check us out at the OPERS festival at the beginning of the school year and sign up to come to the first meeting of the year. Any specific questions you might have you can either send me a private message or just go right ahead and ask it on the forum.
Hope that helps a little bit,
Carmi