As far as I can see, in order to invest in this market you need to understand its nature before investing. This will give you confidence and perseverance when the market goes down.
I will suggest you to invest in the Bitcoin if you are with enough knowledge and if you are not with enough knowledge then you need to stand on the side of the market and should learn how things work. After learning the processes and knowledge I will still suggest you to invest and get experience in short term investments first and then after getting that much experience you will easy upgrade to the Bitcoin.
I would better choose some altcoins as they will give you the best experience in trading, and they will also bring you more money. Pick cheap alts first.