Get a Dogecoin wallet.
Invest in a hardware wallet
It's recommended that you don't keep your Dogecoin wealth just sat around on your computer - just in case your hard disk dies or you fall victim to hackers. And why would you, when there are these things called harware wallets.
Ledger Nano S
Head straight over to the Ledger Nano S website and place an order. Once it's delivered to your door, you can plug it in and send all your Dogecoin to it, and from it. It's safe and secure - which is what you want your digital money to be.
Go to ledgerwallet.com
In the meantime...
You can go to the official Dogecoin website and download one of their recommended wallets.