Since you are new I would suggest you to learn first. Learn how the market works. Learn about the coins. Do researches on the charts. Get to know more about the coins you will be investing on. Use your own instinct and try to figure out how the coin is going to be different from others. And always keep this in mind - invest what you can afford to lose.
Yes i agree with this, dont fear that you are missing profit, wait and observe how market is moving dips happens once in a while grab the oppurtunity, do research on new coins and try to make your hands dirty with amount that you are afford to lose always