The Second Life Marketplace is a place to buy virtual items sold by other residents. If you want to put something on the marketplace in Second Life, first go to any "Marketplace" page. Now, click "My Marketplace" in the upper-right corner and click "Create a Store." Read and check the "Terms of Service" carefully to give your agreement to the Second Life Marketplace Fee and Listing Policies. Lastly, scroll down to the bottom and click "Continue." Once your store is set up, you can start posting your items for sale.