Best advice: give up now.
Longer version
here: Agencies are doomed to decline for the simple reason that agencies need escorts far, far more than escorts need agencies.
Plus, the second you make money from finding someone escort work, you're at risk of the laws against 'control for gain' ? what replaced the offence inaccurately known as 'living off immoral earnings' in England and Wales ? which carries a maximum penalty of seven years. (Is it sensible for governments to say that criminals are involved in running escort agencies while ensuring that everyone who does so is a criminal? No, but that's the situation.) Plus on a conviction, the courts are also highly likely to go after your assets under the Proceeds of Crime Act, which leaves you having to demonstrate that what you own didn't come from illegal income.
Then there's all the other agencies already out there, the costs of advertising, the hours, the worry that 'your' escorts might be finding work where you don't get a cut of the money they earn by having sex (and many of them will be), managing the agency's reputation ('punter' websites may be a mixed blessing, but you will be judged ruthlessly by them), the overheads of having a decent security setup, etc etc. Oh, and don't forget to pay taxes on the income ? it may be money made illegally, but HMR&C don't care about that and they actively look for escort agencies to find the ones that don't pay tax.
Link fixed