The instructor rating will open doors for you. Don't wait, get your CFI/II as soon as possible after you finish the commercial.
How far a long are you in the commercial training? If you still have to do a fair amount of flight training, consider doing the commercial from the right seat. You'll spend less time making the transition when you start the CFI.
As far as pay...the school I work at charges students $50/hr and I get $17. When I freelance, I charge students $35/hr and keep it all. I prefer freelance
- Jeff