Your iPad Apple ID will still be the old one until you change it. Go to the app store in settings and press your ID, sign out of the old one and then sign in with the new one, you can also access it through the App store under Top Charts, Featured or Purchased Headings, just scroll to the bottom. I hope you realize that's apps bought under the old ID will still need to be updated under this ID
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.