Yer Bleeding -> Rotten Arrer -> Exploding Arrer -> Squig Frenzy
Gotta get those DoTs working early, and make sure they have the heal debuff going. Repeat as necessary until the heal debuff lands. Also wanna use squig frenzy on cooldown, and get it running pretty early.
Behind Ya (if possible) -> Finish Em Off -> Run 'n' Shoot / Lots of Arrers
These are our 2 big hitters, so I try to get them in as often as possible. FEO still hits hard, even if not below 30%, so I think its worth using every cooldown. Obviously, I try to use it when they're below 30%, but I have no problem using it before then too. Run 'n' shoot is the default attack, once everything else has landed and im on the move. If im stationary, Lots of Arrers, tho the AP drain is a pain.
Thats my basics for damage "rotation", such as it is. DoT them up, then start burning them down. Reapply DoTs when needed.
Obviously, we have a lot of situational abilities too. Snare for when we need to kite (often one of first abilities used if im kiting), silence (for healers and mages), disarm (useful for most classes), armor debuff (if im stationary AND versus high armor target) and finally initiative debuff (im always in 2 minds whether this is worth it for not). Whether im kiting or not really plays a big part of which situational abilities i can use.
I'm absolutely not the best squig herder tho. My main is my BO, first alt is Shaman, so when it comes to squig i just don't yet have the instincts and quick reactions needed.