If you want to go the organic route, you can start with literally zero dollars. I did it. After I convinced my dad to loan me a thousand dollars and blew it in two weeks, he cut me off, so I had no choice. Me and my business partner just bought a couple of cheap products to film with and posted 4 to 5 times a day. It worked, but it took discipline, and the odds are lower going that way.
If you want the more consistent way, especially running Meta ads, you should have around a thousand dollars. That’s the number I give everyone. About three hundred bucks goes to a theme like Shrine Pro, twenty bucks to order the product yourself to make sure it does what it’s supposed to do, and then you’ve got enough left to test three or four products at around $200 each. If you don’t have at least that, you’re really limiting your data and your odds of finding something that works.