size matters

[surfdog]

coming up to hike and fish in the park the last week in june, I'm a beginning tyer and am trying to only fish with my own ties. I know that stone flies and caddis should be fairly small #16-#18 what about nymph size and any patterns? Also what size do I tie a greenie weenie, weighted or not and I have not seen sizes for beetles or grasshoppers. Any other summertime patterns that I should be carrying.