If you need to see how your stream would look like once it's live, you can create a new FB page, or a Private FB Group, where you can broadcast your project as a test.
Once you have a test page, connect it to the Studio and stream your video.
You can run a test with your FREE Trial. If you've already got some credits or a subscription, you can stop the test stream before its duration reaches 60 seconds, so the credit is back on your balance automatically.