Thanks all you guys for your helping, I'll follow your advises.
There is good website where to buy bitcoin and altcoins using credit card? I have found changelly, but they took some fees ($15 per $100)
https://changelly.com/maybe there is better one?
Well you should check the portfolio of some of the biggest traders so to know what might be good to invest in. Most of the experienced guys are investing mainly in:
-BTC
-ETH
-ZEC
-ETC
-DCR
-XMR
Also you can read about new ICOs and see for yourself what might be a good opportunity to invest.