You know there is already a LOT of information available here on that topic, so a little searching would have been informative - :thumbs:
But for starters, just return to the forum home page and look in 'iPad OS' - there are 2 stickies at the top that will likely answer your questions; also check out THIS ARTICLE is the Apple Support KB area - good luck.
Please post back if you have further questions after reviewing the material above!