Currently you are not able to trade your collection. However, you will soon be able trade your collection. This feature will be released in the near future
There will be a market place to trade all things ... You will be able to access the market place from your inventory. Clicking on an item in your inventory bag will provide you an option to trade. Choosing the trade option take you to the market board where you may list your item(s) for sale or buy things that are listed on the market board.