If you want to trade, and you have bitcoin or you want to buy bitcoin and start trading, here's what you should do. Buy bitcoins from localbitcoins.com and transfer it to one of your wallets*.  Then go shapeshift.io and select a combination from here https://shapeshift.io/#/coins, like btc-eth, send your bitcoin to their given address, also mention your eth address in which you want the eth to be credited and a refund address if something goes wrong, the refund address should be that of bitcoin since you're sending bitcoin first. Why shapeshift because you don't need to have an account to start trading, much convenient too.
*Wallets you can use that is recommended: -
Hardware wallets: -
https://www.ledgerwallet.com/products
https://shop.trezor.io/
Electrum :-
https://electrum.org/#download