Wiring question

I am going to attempt overdriving some NO tubes in the near future.

But, my fixture has a starter wired in to it. Should I leave it in or take
it out?

Also, for the switch on the fixture.... Does it matter which line I run
through it?
For example, do I want to break the circuit with the yellow wires or the one
with the blue and red? I dont think it matters but I want to be sure.

One more thing... How can you test a ballast? Will a check for continuity
tell you anything? What about voltage? What should I be getting and where?

TIA!!!

~Mort