Hi there, I'm Tim and will be assisting you today. I have over 15 Years as an Engineer and have been with eBay, DoD and many others. I will do my VERY BEST to help you. If you like i can offer remote access and a call. In addition, with any positive rating I will support your question going forward for free.
Hey Rosemary, sadly there is no way to add storage onto an ipad, most if not all have no room for external memory. Backing up your ipad with itunes, and then buying a new one if you end up doing so, makes restoring your data pretty easy. Just make sure the old one is backed up, and hook up the new one and restore.
OR an applestore or simply mac will do it for you for free, just take the old one in. Make sense?