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No you don't want another account. Just register the new kindle to the same old amazon account.
First connect your kindle to wifi. Once connected ,
you have to register your kindle to your amazon account to buy the books you want to read.
For that follow the steps.
From Home, tap the Menu icon, and then tap Settings.
Then Tap Registration.
Choose the Amazon account you want to use on your Kindle:
(There you will find the option as given below select 1 if have amazon account and you will have to enter your amazon id and password. And if yu dont have select the 2 option to create a ne one.)
1,If you already have an Amazon account: Tap this option. Enter the e-mail and password ***** with your Amazon account. Tap Register. Your name will appear as the Registered User when registration is complete.
2.If you do not have an Amazon account: Tap this option and follow the onscreen instructions to set up a new Amazon account.
(Note you will choose the 1st option and enter the old amazon account details to register to the same account.)
After the registration process is done your kindle is ready to use.
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