You can try the stickied guide of r/pandabuy. Its a bit of a hassle but honestly not too bad. You have to cross reference listings to spreadsheets that you can find with QCs so you can pick a listing of decent quality. Then QC it. Then pick all the packing options and shipping line. Then ship it.
I've gotten some decent stuff but its the wild west, you have to be diligent in your own QC. And keep in mind the price of the listing is only for the item. Not for shipping for your country and your country's tax, so you can end up having a big chunk to pay at the end that you don't realize. There's a bit too it, take the time to read the sticky guide I mentioned and then go from there. Just like when you started with rep watches take it slow and be patient, learn from other's first-time mistakes.