There are many free "template" type designs, that you can use. some of them are universal, like "wix" and there are also some specifically geared to escorts, like escortdesign .com and escortsite .com, and a few others. Those are good places to start. When you get more established, you can alwasys hire a web designer and build a custom site, or educate yourself in web design (Many providers do their own custom sites).

I would suggest you look at websites of other ladies to get some ideas too. Here are some basic things you should have in an escort website.
1) Your name
2) Your location
3) A little about yourself
4) Rates
5) Pictures. Good ones. not grainy, fuzzy or poorly lit. They can be professional or amateur shots, nude semi nude or clothed. Need not be explicit. Swimsuit or lingerie shots are good. A variety of poses and locations are good. They need to be big. Nothing worse than thumbnails that blow up into...thumbnails! They should show your body and be a fair representation of what you will look like when someone books you. There should not be excessive airbrushing. It is ok to blur or hide your face for discretion, and edit out tattoos, (but you should let people know if you have any)

6) Screening information
7) Contact information
8) Link to reviews if you have any
9)TER hyperlink if you plan to run ads on the TER ad boards, and link back to your website.
10) No music. Many men check out these websites in places where they shouldn't, like at work, or at home with the SO or kids in the next room, etc. Yes they shouldn't, but they do. And clicking on a website to suddenly loud music, that draws other people's attention, is a quick way to make someone click back off the site, and not go back.

Anything other than that is extra
Most guys will go directly to pictures and rates.

Good Luck