You are in for a treat. IDK what you are getting for attachments? I always preferred a gong to use with water. However they sell an ice stem, which is really glass beads not ice, that gives a nice cool hit and you get to taste every little terp that your weed has to offer. And for efficency, you can load a few flakes if you want, but I like a half filled loose pack. Others like to shove a small nug in there. There are usually benefits to giving a good stir after the 2nd or 3rd hit.
Try setting it at 6 and then fine tune up or down from there. Have fun exploring.
Oh, and don't get all caught up worrying about the heater touching your herb. The majority of nanos won't char in the 5-7 range. Just load it and go.