In my opinion, one should take knowledge about any good coin without buying any coin now. Then you can make good profit in your own intellect.
15 days will give you a good time to learn a lot. You do not invest in the work. It will be good for you.
You can buy a coin without taking good knowledge of observing the coin but the thing is that you are at risky side because you don't know the rules of the coin or way about of the coin, but what you are talking is good because some body have to check the values of any coin before going into from starting, because if we fails to understand the value in time it can leads us into disadvantages