There are a few ways to monetize your live streams:

1. Change the viewing permissions so only subscribers (or people that have tipped a certain amount, specified by you) can watch your stream.
2. Change the chatting permissions for viewers of your stream - these options include price per message, one-time tip, subscribed and media purchased.
3. Create a stream goal (similar to a tip goal on your feed) for a specific purpose or just because!

All of these monetization vehicles can be set up on the following page: https://fansly.com/creator/streaming.