Hi and welcome to SaleHoo, tuyu!
Well, what type of products do you want to sell? Once you've thought of a couple of ideas, it's time to start researching suppliers. This is where SaleHoo comes in. Use the directory to look for suppliers for the products you want to sell. When you've found some suppliers who fit the bill, contact them directly for more information and also to ask what the best possible price is that they can give you for the products you wish to buy. Often, the best prices are never listed on the wholesalers' website as most suppliers will tailor their prices to your order.
If you haven't already done so, download a copy of the SaleHoo User Manual and the rest of the PDF guides, you'll find them quite useful.
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All the best!
PS - A profile picture would be nice!