I have installed itunes on computer but don't know how to copy music ebooks and videos i received as present on a usb stick onto my ipad

What kind of new tablet do you use? If it's an iPad, you are able to download books to iPad directly. Just launch iTunes on your tablet and go to iTunes Store, then search for the book you need and click Get below the book cover.
When you want to download ebooks to iPad, you are able to sync the books with iTunes. Having the latest version of iTunes installed on computer, you are able to connect your iPad to computer with USB and sync ebooks to computer.

After getting the ebooks in iTunes library, you are able to sync the books to iPad easily. The following guidance will show you how to finish the task.
1. Plug iPad into computer via USB, and iTunes will launch automatically.
2. Click the iPad icon and choose Books category in the left sidebar.
3. Check Sync Books and choose All Books or Selected Books.
4. Click Sync at the right bottom to start syncing books to iPad.

After syncing books to iPad with iTunes, you will get the books in the iBooks app on iPad. Now you have an enjoyment. But note that you should shut down auto sync before you sync books with iTunes. To shut down auto sync of iTunes, you need to go to Edit > Preferences > Devices on iPad, and check "Prevent iPods, iPhones and iPads from syncing automatically".

If you have downloaded or got books from elsewhere, you can add books to iTunes at first, and then sync these ebooks to iPad. To add ebooks from computer to iTunes library, you only need to click File > Add File to Library at the upper left corner of iTunes, and then the ebooks will be added to iTunes Book Library.

Visit this guide for more methods about how to transfer books to iPad tablet. http://www.leawo.org/tutorial/download-ebooks-to-ipad.html

You are able to move the books to computer, and then sync ebooks to iPad with iTunes. When the Kindle users connect their Kindle tablets to computer with the USB cable, their computers will recognize their Kindle tablets as external hard drives. Then the users can copy and paste the ebooks from Kindle to computer easily. After that, the users are able to sync the books from computer to iPad with iTunes.

This is easy to be done. But when users begin to sync their iPad with iTunes, they may come up with the sync problems of iTunes. The problem may come up when users sync ebooks from iTunes to iPad. During the sync, iTunes will erase all the non-purchased items in your iPad mini. If you are new to iOS devices, you will probably lose files during the sync with iTunes, so you'd better close the auto sync and manually sync the ebooks to your iPad mini with iTunes. The following tutorial will be helpful if you aren't sure about how to accomplish the task:

1. Start iTunes and go to "Edit > Preference > Devices", and check "Prevent iPods, iPhones and iPads from syncing automatically".
2. Plug iPad into computer via USB cable, and the software will recognize your iPad and display the iPad icon at the upper right corner.
3. Click the iPad icon and choose "Books" in the summary panel. Choose the books you want to sync to iPad in the list below, and click "Apply" to start.

How to Transfer Ebooks from Kindle to iPad mini

I need more info to help you solve the problem. If you mean you don't know how to download photos and videos from computer to your iPad. Hope this help.
For photo, Plug your iPad into your computer, open the iPad folder go into pictures and all your photos are going to be there. Then minimize that on half the screen, open the photos in your library on your computer and minimize it to the other half if your screen. You can either drag on pic from you computer library to your iPad library; or you can right click on the photo you want, click copy, then place the cursor on the iPod library and right click again, and click paste.
For video, If your video is already mp4 video, you can import the mp4 video into iTunes at first. Connect your iPad to computer through USB cable, iTunes will recognize the iPad automatically, and then go to iTunes menu 'File -> Sync iPad', the video will be transferred to iPad.
If your video is not iPad compatible mp4 video, you can follow this step by step guide to convert and sync the video to your iPad, it's easy to understand and works pretty well for me.
http://www.dvdtoipadripper.com/how-to-rip-dvd-convert-video-to-ipad.html
Hope it helps. Contact me if you have any other question.

Hi,Thats because Itunes has a DRM on all movies/music/music videos.What that means is the music will only work when using I players,that is to say that anything you have from Itunes will only work on a Iphone,Ipad or any other Apple product,now software is out on the web to help with that but I don't know what it is or even if its legal!!!!
I know you didn't want to hear this but that Itunes,hope I have helped you understand why its not working.....

iPubsoft iPad iPhone iPod to Computer Transfer is the best choice to backup the data betweent th apple devices, including iphone 3gs/ 4/ 4s/ 5s, ipad, ipod etc. iPubsoft iPad iPhone iPod to Computer Transfer

Yes, just plug in the iPhone into the computer via USB that you have the iTunes on and you sync it by clicking "sync" and a message will pop up asking if you want to transfer your purchases to your library and at that point you click "yes".