Well, the first thing you will want to do is get your recovery rom installed so that you can do nandroid backups as well as block ota updates.
Check out this thread:
http://www.droidforums.net/forum/dro...challenge.html
Or you can grab DroidRootPro from the market, it will apparently do a lot of that stuff, I just haven't used it so I can't say one way or the other.
After that, check out some of the rom reviews, I am pretty partial to bugless beast myself, others aren't fans of overclocking and like bugless beauty, some like 2.1, some like sholes, there's lots of options, check them out.
Welcome to the dark side
