I feel for you. We run several SharePoint sites and it has been more difficult to find definitive answers regarding SQL database configuration, troubleshooting, etc. than with non-SharePoint databases.

That said, here is an article from Kimberly Tripp I refer back to from time to time:

http://www.sqlskills.com/blogs/kimberly/database-maintenance-best-practices-part-i-clarifying-ambiguous-recommendations-for-sharepoint/