Welcome to LV
Browse all the readers wanted forums and find something that interests you personally - every project in those forums has a coordinator who is waiting for you to volunteer - I'd suggest something not too long, but if it's really one of your strong interests I'd go for it
If you like poetry, the weekly poem is always a good place to start, it's short and catalogued quickly which is nice when you are new - and it has a Canadian running it, so you can talk about digging out your house and all those strange things
I've never done voice work myself, so I'm excited to try it out. I've just finished the one minute test and I'm looking for projects to help out with!
(thanks for the plug)