In general it is best to have a website as AM will want to know how you will be sending traffic to them, however I noticed you can send them an email if you are having difficulty supplying all the information.
If you don't want to make a website it may be worth contacting them and discussing how you plan on promoting them and the AM should be able to create your account easily.
Any particular reason for Bet365 as I know of a few others where no site is required.