If you're new to trading then it is best to start from bittrex. It has the min of 0.0005 btc for an order (buy/sell) to proceed, which is not much at all and I believe the min deposit sum is just the one covering transaction fee. Bittrex has a lot of coins on real prices and the interface is very easy, so you will feel comfort during your first trading experiments. What's bad about this exchange is perhaps only that max withdrawal is sometimes considered low and that to withdraw the money you have to let the website know who you are.