Where do I start?
P.S - How is BTC expected to be the future if it so volatile, you will always have to worry about how much your paying ETC.
Your decision is very good as BTC is the most suitable coin for investment into crypto.BTC carries higher risk but higher return as well.ROI is highest in BTC than any other Altcoins.Currently BTC price is down and is good time to invest.My friend invested in BTC on 6th Feb-18 when price was around $5,900 and right now its price is $8,000,you can imagine huge ROI.This is the quality of BTC investment.I would suggest you to keep BTC at your top most priority in order to gain your planned ROI.