What can I do simply to keep all my previous contents, (own pics, videos, etc.) on my previously authorized iPad on PC, but get a new authorisation and a right syncronization, without data loss with a new iTunes on my new Mac?

Question

Friends,
I already had an iPad(1) and its full contents (not only the purchased items, applications from Apple, but my all own pics, videos, songs etc.) is normally syncronized with an authorized PC (Windows) computer.
Now,  I've bought a new MacBook Air computer, and want to sell my PC. But I don't know how to transfer (or syncronize) all of the contents from my previous iTunes on PC to the new one on the Mac.
When I connected my iPad to my new MacBook Air, I promted, if I want to change authorization of my iPad to the MacBook.
But also got a warning, that the new iTunes will delete from my iPad all my previously syncronized items, pics, videos and music, with the previously authorized  iTunes on the previous computer, expect the saved pics from the net.
What can I do just like that, simply  to keep all my previous contents on my iPad, but have a new authorisation and a right syncronization, without data loss with the new  iTunes on my new Mac?
Thanks a lot for your answer.
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Answer 1

Here are some instructions that I have posted several times that may be helpful to you as they have been to others. You can simply ignore anything that does not apply or that you have already done.
As Alan stated above - transferring the iTunes library is the best first step. If you can transfer the iTunes library to the Mac, most of this will be unecessary for you to do.
Very Important ....
1. Authorize the computer.
2. Turn off auto sync in iTunes
3. Transfer purchases
The text in italics is from the other thread - non italics are my words.
The following was copied from this thread. This is essentially what you want to accomplish.
https://discussions.apple.com/message/11527071#11527071
1) Without connecting your iPad to your new computer, start iTunes. Click on iTunes. Click on Preferences. Click on Devices. Check the box next to "Prevent your iPod etc. from automatically syncing." Click OK.
2) Now connect your iPad to your computer and start iTunes.
3) When iTunes starts, right click on your iPad under Devices in the left column. Select Transfer purchases etc.
4) After it finishes transferring all your apps to your computer, right click on your iPad and select Backup your iPad.
5) After it finishes backing up your iPad, right click on your iPad and select Restore etc.
6) After it finishes restoring, left click on your iPad , then click on the Apps tab on top, and check the box next to Sync Apps, then click on Apply below.
If everything on your iPad looks good after the sync, go back and click on iTunes / Preferences / Devices and UN-check the box next to Prevent your iPod etc. The only other thing you may want to check is if your contacts, bookmarks, etc. are syncing correctly now. If not, go to the Info tab after connecting and make sure you indicate which features you want to sync with what sources.
Read this thread and the support links as well. There are apps that you can purchase that will allow you to transfer photos from the iPad to your computer. Look at Photo Transfer App in the App store and you can search for others as well.
https://discussions.apple.com/message/13016026#13016026
This support site will help you with transferring iTunes music to your new computer.
http://support.apple.com/kb/HT4527
One final note - you may want to leave auto sync turned off - but that is totally up to you. I never did use auto sync.