Its been a few months since I started/drove my Gs500F 2004 bike, but I tried to start it recently and it wouldn't start. The bike turns over for a few seconds and shuts off.

I charged the battery, and changed the spark plugs. I cant choke the bike either to get it to start. Any suggestions?

The idle circuit is fed off the pilot jet and its a branch off it and into air mix screw circuit it feeds gas. You may need to make sure that whole pathwat is clean. And air screw is set at the right 3 or so turns out.
Cool.
Buddha.

What do you mean by "can't choke the bike?"

Like, the choke lever doesn't move? Or the choke on the carb doesnt move? Or the bike doesn't act like the choke circuit is engaged?
If you have the original carb jetting, airbox, and exhaust the bike usually needs choke to start so you will have to make sure its all operating correctly.

Most likely if the bike was sitting for months with E10 gas in the carburetors you will need to at a minimum clean the idle jets.