First Timer

So this is my first time ever attempting to even sell any of my Art in any way shape or form. I recently started making repeatable patterns. It’s so fun. Lol. I’m a stay at home Mom and hoping to make some money on the side. Every cent counts you know?? Lol. I’ve done research but I’m getting confused.

Now my questions:

1. How much is Etsy?? Commission and to post??

2. Is it worth it??

3. Should I add a Watermark to my work??

4. How does selling a repeatable pattern work when sold?? do they know how to make it repeat?? Although I’m sure it‘s easy if I do it right. Lol.

5. how does it work when you sell a digital product?? Do I send it to their email??

6. Any other info you guys an offer would be great please. I’m extremely new to this.

Also, If you guys have other groups you want to direct me to so I can learn about this stuff would be great please.

Thanks in Advance.