You can start by setting up your store and sharing it on Feedback On My Store channel to get some feedback.
Post that you can start running ads on Fb, Insta and Google to drive traffic to your website.
The people in the community can guide you based on what kind of problem you are facing.
If you don't have your own product line, you can study a but about running a dropshipping business and get started with that.
Let me know if I can help you in any other way :)
Wish you all the best and hope you do well.
ModeMagic - Product Labels