Record Label Resource is, according to their home page, "the best resource on the internet for the independent record label. It doesn't matter if you're just starting a record label or you've been running an indie label for years -- our site offers an incredible wealth of music business information and music industry contacts. We provide free, unlimited access to our extensive music industry database, with information on CD manufacturing, CD mastering, radio promotion, entertainment lawyers, and so much more."
Lots of links and info - Business Essentials, Publicity, Legal, Radio Promotion, Manufacturing, Record Companies, Mastering, Recording, Printing, Touring and Retail Marketing.
Great place to start.