my question is basically, how to find a team for a project if an idea is already there and a concept written.
Maybe here is someone who has the experience and already a running project and have some tips how to find a good team and start the project.
Main fact is, for what you are looking for and what kind of project are you going to launch. Most likely you are alone and you have a concept or idea and you need some people who will work for you. But it would be very difficult for you to manage everything, since you are alone on real life. You should have a real team on real life who would support you. Then you might hire someone from marketplace to do your work like web design/development and so on. Hire full team isn't wise decision and likely you will face problems in near future.
If really you don't have team real life or if you are unable to manage, then try to find IT firms (web developers team) from your country and they would help you to build everything for you. Hiring all team member from different countries over internet would make you trouble. So better to seek for a real team.