Kill switch position is #1 newbie mistake, #2 most popular trick is turning the key all the way past the "ON" position all the way over to the "PARK" position (which only energizes part of the electrical system but allows the headlight to burn and drain the battery).  

#3 most popular newbie goof is forgetting we have interlocks on the clutch lever (must be pulled in), on the neutral gear light (must be in neutral w/green lite lit) and on the side stand (must be folded up into the "go" riding position -- or else if you do have the side stand down you have to be in neutral with the green light lit AND with the clutch lever pulled in).

Fourth most popular newbie mistake is screwing around with the #1, #2  or #3 mistake long enough to deplete the battery just a little bit --  just depleted enough so engine will will turn over but NOT actually start -- this is due to battery stored voltage dropping below 12 volts which makes the electronics black boxes act irregular on firing the plug but the starter motor will still try to operate and weakly move the engine to roll over.

Solution to 1 through 4 is to charge the battery thoroughly over night with a 1 to 2 AMP motorcycle charger.   Then in the clear light of day LOOK at the position of the handlebar kill switch position and the ignition switch ON position.  SIT ON THE BIKE with the side stand folded up and the key in "ON" position, pull the clutch lever in and hit the start button.  

(PS  Don't choke the bike -- unless it is cold it doesn't need it)

Vroom.