first you need to get knowledge of the past and present of any coin you wants to trade. Keep an eye on the market as well as other coins. Whales will do the rest of the things 
Before you start trading, you need to be familiarize the way of trading. Because if you will just immediately trade without the proper knowledge, you might trade without gaining. So make sure that when you start trading you already have all the knowledge that you need so you will not be worried of the amount you will trade in the future.