Unfortunately, there is no direct career path for criminology. It is something that may be used to help provide insight for careers like social work, counselling, etc. Or it is a compulsory componant to become a police officer. I have studied some criminology as part of my law degree - it is very interesting, but like I said it is one of those things that are generally studied as part of a larger overall sutdy program. Like an arts degree, it is useful, but generally won't actually help you get a job. Does that make sense?

What area of work would you like to go into? That might be a better place to start, and then figure out how you can incorporate studying criminology into that.