Okay, I have been working on this for hours now, ugh! I do appreciate all the help, and here is where I am so far:
1. On new PC, installed iTunes, it set up a new library locally on the laptop. I pointed it to the NAS in the preferences>advanced. I did the import and it took quite a bit of time as I have like 7000 songs and there are 250 apps. When finished, I verified files not stored locally, no problem, that was fine. I then turned the copy media function back on and checked the keep organized tab. Well that opened a can of worms and I had to point like 100+ songs back to where their MP4 files were. Ugh! When I was almost done I think it started to do this by itself, does this make sense?Also, If I were to go to file>organize library, what would that have done and would it have screwed anything up? Why would I do that in the future? Anyway, after all was said and done, have some issues with it. It can see the music/video/apps etc on the NAS and play them. That is good. However, the NAS does not show up in the shared area on the left as it should, I can't see the old desktop (see #2) that I set up and I set up sharing however I can't see it in my Apple TV and I don't see the airplay logo in the bottom right of the screen as I should. Now, this is an issue that needs to be resolved. This is your #1 mentioned above.
2. I opened iTunes on the old desktop, held shift, and created a new library locally. All fine there. I have home sharing on. I can see the NAS and music under the shared area. I however can't see anything else on the NAS such as video, apps, etc. When I hit the music (not the shared section) and the video , there is nothing. Basically, it is not accessing the NAS for it's files other than where I see the music under the NAS shared area. I think the reason for this is I did not do as in #1 above import function as I was afraid I would screw up the folders on the NAS like I did when I did it on the laptop. The preferences are pointed to the media file on the NAS however. I can also see the laptop under the share however it seems to not see anything and times out and goes back to welcome screen. Also, it is sharing with the apple TV however since it has nothing in/on it, it says the library is empty and the apple TV can't play anything. All I want to do is have the laptop accessible to apple TV anyhow so I can see the videos. So, how do I fix this situation? This is your #4 and #5 mentioned above.
3. I would like to add sharing to other computers however since #2 above did not work, how will it work on others? (like my sons and my wifes laptops?)
4/ iTunes match is running now and I plan to use it on other PC's once I can solve the above. Please help.
5. What does this mean: 12) Basically unless I'm going to be off my local network, the iTunes library on my laptop is an empty shell and I don't have any media (except for photos/home videos which aren't part of iTunes anyway) stored on it. a) music thru iTunes Match, b) video/podcasts via the Home Share, c) iOS apps downloading to iTunes I have turned off because I can always get them again via the purchased tab of the AppStore (although I do have the Mac Mini set up to download any apps purchased with my Apple ID because I'm paranoid).
I understand you don't have anything stored on it but what does a,b,c mean and where is that option?
I really need help, thanks!