Any metal roofer types out there

[lee]

I'm just finishing up building a nice 10X14 wooden shed. It has a simple shed roof.

I'd like to put on a galvanized metal roof, but can't figure out what to do at the upper edge and sides to keep wind driven water from getting under the edge. The lower edge I just assume regular drip edge (but I still wonder about water getting driven in by rain. I was planning to put on 5V crimp panels.

I can't find anyplace on the web that deals clearly with the edge fastening for metal roofs. The local Home Depot sells a bunch of stuff (drip edge, a J-chanel, z-flashing, and a large L shaped piece) but whenever I go there nobody knows what I need to make this work.

tia