If someone is watching my house can i shoot them?

Lets say there is a suspicious car that does not live around you, and you dont know who they are, but it is safe to say they are up to know good. Would i have a right to shoot them? because they are tresspassing in a private community that they do not live in? can i call the police and press charges to mak sure they get arrested? how would i make sure these people get in trouble?