Injunctions

Questions:

How do I get an injunction against my ex-partner and how much does it cost?
Someone has put a video/photograph of me on the internet/is showing video footage of me in a compromising position to friends etc., without my permission, what can I do?
Will the police get an injunction for me?

I have got my bank statement this morning and there are some transactions on it that I have not made, what should I do?

For police non-emergencies dial 101