Ok one of my friends did this and did get paid well for it, however the agency ended up ripping him off. Another friend signed up with the same agency and got ripped off before he even got a job.

My best mate at the moment wanted to get into it(with encouragement from his gf) and every agency he contact wanted money up front and all kinds of bullshit.

If I haven't discouraged you enough, I used to work for a consumer advice company and opened quite a few letters from gullible men complaining escort agencies had taken their money and ran.

Also I think most of the clients are middle aged woman looking for someone who can pose as a bf to go to work functions with. At 19 you're a bit young to look the part.