Please see link below for getting a Tennis ID if you don't have one and a UTR Rating.

https://www.tennis.com.au/competitiveplay/create-your-cpp

There are different options on the site - click on what is relevant

1.You need a Tennis ID and a Universal Tennis Rating

2. If you have a tennis ID and need Universal Tennis Rating

3. If you have a Universal Tennis Account and need a Tennis ID

4. Unsure if you have a Competitive Player Profile