That can be really challenging in the beginning because you don't have any audience, or if you do, that can be 1% better.
My suggestion for you in the beginning is to only focus on organic marketing such as Instagram, TikTok, Facebook, and Twitter (X).
Be yourself, make valuable short-form content, for example, make shorts like: best way to get abs fast or how to get rid of face fat, etc.
Make a good following with valuable content...
While you're doing that, you're going to move that audience to a squeeze page or landing page. On that page, you will need to provide something for free.
like a free E-book for weight loss or something like that.
"Wait, why would I give these things all for free?"
Simple: you want to build trust and get their emails to do email marketing.
If you are smart enough to use organic marketing advantages, you can earn $1,000 from a 1000-email list.
So, yeah, implement these things in the beginning, and after that, start taking action...