First things I would check is the on/off switch. Then make sure you are in neutral and your kick stand is up and try it again. I've experienced that nothing thing and it was the switch being turned off or the bike was in gear and my kickstand was down. Mine won't start either way. Also, when I bought my bike I got it really cheap because it wouldn't start...turned out the safety switch wire to the kickstand was unplugged. Lucky me!!!
If it's not one of those I'd be checking the starter switch. If the lights brighten I would tend to doubt it's the battery...but it could be. Voltage meter time then. Good Luck to you!