First things first. Eliminate one thing @ a time.
Take a spare spark plug. Pull the cap off #1 and put the spare plug into the cap. Touch the plug to the engine (make sure fuel isn't on) and see if you get a spark arc'ing over to the engine as you hold in the electric start button. Repeat that process for each spark plug.
If, at the end of this process, you have spark @ all 4 plugs, then spark is most likely not your problem (theoretically, you could have a bad plug and would have to unscrew each plug and test to confirm but the likelihood of that is so small that I would only try that after everything else).
Once you have eliminated spark, then it's most likely a fuel problem. Personally, I'd remove the air box and start the bike without an air filter on it. This lets you visually confirm the slides are completely closed when you have it on full choke.
Also, go get some more fuel. Put enough in there that the the tank is 2/3 full and just eliminate that as a potential source of problems.