Welcome Lok
Suppliers will be quite open with you, they will either say yes that they will drop or they will say no. So it's the dropshippers that you want so you don't need to keep any inventory at all.
With the dropshipping, the supplier will send the item direct to your customer, all you have to do is tell them where to send it. Then they will send you the cost price invoice, so what you do is send the customer your own invoice with your price.
Cheers