If you're starting out, headline and button together is a good first test to run. Make sure you ke way the test right before you put it out into the world. The more risky or risky ore the copy or the test that you're running, the more you want to throttle that traffic back. You can actually run a test to get confidence in your conversion rates.
Joanna Wiebe is the creator of Copyhackers and the Copy Chief at CH Agency.
For nearly 15 years, she has worked with incredible companies like BT, Canva, Glowforge, Intuit, MetaLab, Prezi, SAP, Sprout Social and VWO to optimize their copy.
Check out: https://copyhackers.com/