That's what you have to do:
If you use iCloud and "Find my iPad" is enabled there, disable it. Then go to Settings - General - Reset - Erase all Content and Settings. This will remove all your information from the device, and you can set up the iPad as new afterwards, entering his Apple ID and informations.
The IPad Forum is a community of members from all walks of life and from all over the world coming together to share our experiences and to help each other learn about this wonderful piece of technology the Ipad. There is a wealth of information already here in the many threads we have so doing some searches will answer most of the questions you have. If then you cannot find the answer you are seeking then by all means post your question. There are many friendly and informed members here only too willing to help you.