How do you find an agency?

im thinking of becoming a male escort and was wondering how to apply for an agency. I dont mean like online websites as i feel these may be more dangerous as youre meeting randoms compared to with an agency they may be repeat clients etc. Also, i dont really want to post loads of pictures advertising myself online due to fears of being found out affecting friends, family and job opportunities. I am based in the East-Midlands UK and im willing to service both men and women