If I have new coin idea, then what?
Write about idea (white paper or whatever), then where to register it to spread it to public ICO investors?
Should I first setup ethereum token distribution system?
Setting up token is not that hard. You must understand that the information about the team involve in an ICO and past experience is important along with genuine white paper, road map, the feature of the so call ICO, registering your ICO to legit crypto community site(with legit ICO social site like icobench, coingecko, blog icoalert etc) and hosting a signature campaign on here are the best way to make your ICO successful.