By your small post, what i understand is your asking how can you find products to sell on your online store? You sell the products you own in a store. Or you buy products and then sell it. So you would have to get products with reseller rights to be able to sell them from your online store.
Normally people use dropshipper product to sell at their site. There are a lot of them such as dhgate.
I can not understand your meaning,maybe you want to ask how people find your site on search engine? You should seo for your site,good title,content,high quality backlinks.
If you have built a store that has no products then you have been misguided by someone else. You have to have a focus, you have to care and you have to have something to sell.... In terms of having something to sell... you have to house said product(s) locally, or find a reputable dropshipper. The latter of which I am finding a bit vexing myself lately. hope that helps, Nigel