I just started playing this game a few days ago and I started at Coruscant. I heard you can become a jedi or a sith. where do you find a jedi or sith near/on Coruscant to tell you if you have the force in you?
Your best chance of being Force tested is to join a faction, as the Jedi only schedule faction-wide testing now. The Sith do not test anyone outside of the Empire or its allies.
However, please be aware that it is highly unlikely that you will be Force-sensitive, and some people have played this game for 7, 8, or more years and have never had a Force-sensitive character. It's best to just play the game, enjoy it, and then deal with/be happy about the fact that you have a Force sensitive character if or when that time comes.