First of all you will need a place where you buy ethereum I suggest using https://www.coinbase.com
The transfer wait times are quick.
Secondly you will need the wallet https://www.myetherwallet.com/ this website lets you keep your wallet as a file which you can then put on a external storage device.
When you are on the main page type in a password of your desired choice and click generate wallet,
then it will allow you to download your wallet right to your computer, as I said you can store this wallet on an external storage device allowing for complete safety.
If you wish to access this wallet click on view wallet info on the site and choose keystore file, you then select the file you stored on your external storage and type in the password. it is a safe and simple way of storing your ethereum.
Hope you enjoyed this, waspyy