Let me try and sort this out for you, briefly. Stalking and terroristic threat are crimes, so you notify the police and they take it from there. You can cooperate with the police and DA, but you do not control the case.
If the person has come on your property and caused damage or has otherwise hurt you, you can sue for damages. This can be for several different things depending on what applies. It could be assault, defamation, conversion, etc. Defamation has a statute of limitations of one year. Most other kinds of case have two or four year statutes of limitation.
If you want to file a civil suit for damages, you should consult with and attorney imediately.
This is not legal advice. You should always discuss the specifics of your issue in person with an attorney. Be aware that there are time limits on all claims that depend on the kind of claim, so do not delay in seeking an attorney.