Here is a link to a guide called RoOoler's Ultimate Droid Guides. It will give you specific help with rooting, flashing a rom, using SBF (recovering to stock), overclocking and making backups. The directions given are clear and easy to follow. This is a gold mine for newbies. Don't forget to support him with a donation if you can! 
Ultimate Droid Guide
Ultimate Droid Guide