Hi @TSOoi
I would recommend to buy ETH instead of BTC. ETH is faster and has cheaper networking fees. Also you should definitely choose Binance instead of Bittrex for 2 reasons: No verification needed up to 2 BTC on Binance ( can be weeks on Bittrex) and cheaper trading fees.
Check out that post I wrote comparing Bittrex to Binance: Which is the better exchange platform?
Best of luck!