However, fee is expensive thus it's not worth to send very small amount of btc. I think BTC0.01 is no bad.
I am sorry to say, but despite the increased price nowadays, 0.01BTC is still what I consider to be a very small number of coins for trading purposes. Let's assume you have had an exceptional day of trading, you end up with 10% profits, which is fantastic, but that excitement drops real hard when you consider that 10% of 0.01BTC is just 0.001BTC. If you want to make it a bit more worthwhile, allocate a few hundred bucks for trading, and it will definitely feel much better when you look at your gains.
