It's extremely hard to trade with a small amount of keys. You have two options. You can buy more expensive stuff with your keys and try to sell for a higher % of market or you can buy smaller items and try and get market for them. For the second option get skins 5 or 10 dollars and buy them for a key less. Profit will be slow but if you do it enough you can move on to better items. I did these things for around a month before moving on to trading larger things like karambit dopplers, m9 tiger tooths, and a lot of other cool items worth over $400. I would suggest sticking with a few items though. It can be hard to manage multiple items with a fluctuating market.