In case you have 2 legs and 2 arms , what you are doing - judging from the information you shared - is really inefficient. You are trying to safe maybe 50$ , but the decisions of trying to safe money on it is consuming already so much of your time… reading left and right, posting here, making a thread, doing research, that you could have made back that amount of money with literally any online job already and your shop could be online and running already.
If you want to get into ecom you want to get traffic that converts first before you think about any optimizations. Because especially in your situation - not going the 0815 dropshipper way - on what data will you try to base your decisions on? You don’t have any data.
Get your fucking shop online asap and drive traffic in whatever way you feel comfortable with. Get the shit done and don’t overthink it. What does it matter if your shop is running on wix, shopify, or whatever if you don’t know how to drive traffic that turns into sales? It doesn’t matter. I have seen shops convert that look like a big pile of ****. Cold traffic won’t convert most of the time anyway, especially on mobile traffic.
EDIT : Don’t sell more in value that you can afford to lose. If you think only IMers are online scammers, then you haven’t seen the average consumer yet “didn’t receive package”, “came damaged”, the list is endless.