I would like to sell in the flea market? Where in Illinois can I buy clothes, handbags at wholesale prices?

I would like to start selling at flea markets in Chicago or suburbs. However, I do not know where to start to purchase items at wholesale prices, get a tax ID number and etc. Can someone please advise me on what steps I need to take and what wholesale stores or websites can I go to to purchase items at wholesale price. I thank everyone in advance for your advice who experience with selling at flea markets and buying products at wholesale prices.