Having achieved everything you have mentioned in order to teach at a CPL level the minimum exp you will require is as follows from CAP 804, Section Four, Part J, Subpart 1, Page 1,
https://www.caa.co.uk/application.as...detail&id=5000
"...at least 500hrs of flight time as a pilot on that aircraft category, including at least 200hrs instruction."
The pay scale at PPL level is pretty poor, when i did it, it was approx £7000 per annum plus £20/hr flight pay. However from speaking to many others this is probably on the high end of the pay scale Other places can be much worse.
On the CPL side things are better, I can only really speak for myself teaching on an integrated course but £27k per annum, teaching CPL, IR & Night. I have no idea what king of pay you might receive teaching on a modular basis.
Hope that might help, good luck.