RE: Any info for covering on which to use and what techniques
I'm guessing that you haven't had replies because answering your question could take pages, and a LOT has been written about covering.
RCU has a GREAT "SEARCH" engine. Go to the top of the page, click on "Search", then plug in "Covering" and see what you get. (I'm guessing you'll get about three days worth of reading!)
Dennis-