Do I have to have a Bluetooth accessory to connect my iPad and my iphone?

As said by Giulio above, there is no support for direct bluetooth connections between an iPhone and an iPad.

What exactly are you trying to accomplish?

Most things that require bluetooth between an iPhone and iPad, do not require a direct connection.

Sorry, there's no way to connect an iPhone to an iPad (and viceversa) using a Bluetooth connection.

Regards

Giulio