Bass Guitar

Somehow, I got press-ganged into playing bass guitar in the worship band at church. It's pretty simple, really: Roman kept asking until I said "yes". I don't have a bass guitar, so we need to find a bass somewhere. Roman put a request out at church, I think one will turn up eventually. Once we secure the bass, I need to learn to play it. I played guitar a little in high school and have played the bass part in Rock Band, so hopefully I'll pick it up quick. Anybody know of any bass tutorials available online?