You can request your Apple Music artist page through the following link: Apple Music
Follow these steps to claim your page:
1. Log in with your existing Apple ID. (The one you use to buy music / apps / movies from the iTunes store)
2. Add the artists you are managing.
3. Enter your role and fill out all relevant details for Apple's verification process.
Apple Music should then be in touch with more details.
Note - If you don't already have an Apple ID, you can sign up for one here