If you want to securely store Bitcoin in the long term, take a look at the Card Wallet.
For quick and easy use of Bitcoin and Ethereum we recommend "Breadwallet", here you will find installation and setup instructions. There are other providers of Bitcoin wallets, you can find a detailed list here.
For use with all other cryptocurrencies (LTC, DASH, ...) we recommend the Wallet Jaxx.
After creating a wallet, come back here to redeem your voucher.