Pretty much works like this. Always get E first. If you plan to gank lvl 2, get Q next. If you plan to continue to jungle instead of gank, get W 2nd instead, then Q 3rd.
Lvl 2 gank works best if your red is at top. You have a shorter distance to travel while they have a longer distance to escape through. You can still gank lvl 2 if you're red is bot, but bot lane is usually warded already and easier to escape, what with the usual flashes and heals. You could always start with wolves -> blue -> and then gank top. If my red is bot, I usually just grab red and go the counter jungle route or I'll ask my team to invade their red, and then gank their top afterwards.
