Unfortunately, there is no way to password protect a stock iPad. However, if you jail break, there are several tweaks that will allow you to set passwords on apps or folders (or both).
But, as mentioned, the lock screen password is the only option on a stock iPad. Sorry.
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.