Have you tried starting it without pulling the choke?
When you have managed to get it to fire, it dies right away? Can you keep it running by revving it up a bit?
How did the bike run the last time it was used? How long has it sat since it ran (properly) last?
My guess is that the idle circuit in the carburetor has been fouled. This can happen when a motor sits for an extended period and the gas in the carburetor evaporates away leaving a concentrated "goo" in the float bowl. It can be especially bad if you left the gas turned on as the entire tank can distill down into a really nasty goo. This can be a major problem on a two stroke because the oil doesn't evaporate like the gas does so you end up with a very thick oily goo.
If the bike has sat for a couple of months then you might want to try taking the carburetor apart and cleaning it out as much as possible. If you have comressed air blow some through all the passages. If you have carburetor cleaner and can get a rebuild kit then I would recommend a proper soak in the solvent.
Or, since it is new you can take it back to the dealer.....
Rod