We are also starting Reading Street this year, and won't get official training. If you have access to their website, there is a tutorial there.
Also, here on PT, look under Groups (on the top right) and there is a 2nd Grade Reading Street group! There are tons of good ideas there with additional website, etc. Let me know if you can't get to it.
Don't be worried about centers, I don't start them until at least a month into school. That gives me time to introduce and practice, practice, practice centers before they go on their own.