Sorry can't help with flywheel removal, I've never done it.
By the kill switch comment I just meant is the little switch (where you can see "off" written in the 1st picture from post 19) in the run position i.e. it is up.
The electrical plug is for the accessories harness, drives the tachometer for example. You don't need it connected.
I wouldn't be worrying about plug 3 yet, just a bit of carbon. When you get the engine running a bit of sea foam in the first tank will probably sort that out. But 1st advise still valid. Buy, beg, borrow, or steal a compression tester, but check that compression.
Don't know what the pull knob is for, on my engine there is a small button on the enricher valve you press for manual choke. Your's could be different I suppose.