Check the obvious first:
got plenty gas?  

Try turning petcock to PRI in case it's not getting enough vacuum for some reason.

(It won't even turn over if in gear/ks down will it?)  

Kill switch to run possition, petcock turned to on, choke out, ignition key to on, bike in nuetral, clutch pulled in then hit starter button.  That's pretty much the basic starting procedure. Anything happen with the bike loading or unloading it?

Pulled the plug which had a dp7ea-9 spark plug instead of dp8ea-9.  Could this cause an issue

Glad you got it started.

I'm guessin' that you may have wet-fouled the plug by twisting the grip with the enrichener engaged.

In general, on these bikes, when starting it's best to leave the throttle closed when the enrichener is being used.

Yep, our carbs really don't have chokes, they have fuel enrichener circuits.  Pulling out the "choke" knob opens an additional path for fuel to flow through.  The supply of air is not "choked" (restricted) by pulling out said knob.

When mine (see signature) is cold, pulling said knob out halfway will give me a good start.  If the bike's been sitting for more than two weeks or so and it's cold out, I may need to pull said knob all the way out to get a good start.

On mine, after the engine's been running for about a minute or so, I can generally push the knob in all the way.  Then, I like to hold the throttle open just a bit to keep the oil flowing (avoiding a low rpm idle) while the engine is getting warm enough to ride.  After about two minutes of this, I start riding, being gentle for about the first mile or so.

YMMV!