Itunes on external hard drive to a bigger capacity external hard drive

Question

I have Windows 7 on my laptop. I have my ITunes on an external drive, the path was as follows H/Music/ITunes/ITunes Music. That external drive filled up, so I went and bought a 1TB one, figuring that would be enough space for my music and movies. 
The problem is that I'm confused as to what my subfolders on my new portable drive should be.
I want to keep my ITunes Folder in my PC as the way it was
C/User/Me/My Music/ITunes
and then haqve the ITunes Library be transfered from External Drive H to my new External Drive M. Well, I read some posts and I got confused as to how to transfer all my files from one external drive to the other and I think I messed up big time, since now when I try to go to H/Music/ITunes/ITunes Music I
encounter this H/Music/ITunes/
and then when clicking H/Music/ITunes/ITunes Music/ITunes Music I get this
It sure does seem like a lot of subfolders which I did not have before, so I opened H/Music/ITunes/ ITunes Library.itl and opened ITunes pressing SHIFT and then pointed ITunes to that end, but now half my movies are gone and so some of my music.
But that, I mean I go to the external drive and open H/Music/ITunes/ITunes Music and then click on let's say the Movies folder to open manually and I have all my movies on the list, they just don't show on my ITunes when I open it.Not only that, now when I open Itunes, I have to agree and else, as if it is the first time that I open it. And neddless to say lots of my music has the exclamation
So I know I made a mess of things, but if anyone can help me (I'm no genius for sure, far from it) I would greatly appreciate it.
What I need to know (in simple terms if at all possible, please ) is what folders should I copy or transfer from my H drive to my new M drive so I can open ITunes again pressing shift and choose library accordingly with all my files in...
Eternal good karma towards everyone that even took the time to read all this nonsense from a newbie, and double the good karma to those that will help an old man out.
Cheers!

Answer 1

These are two possible approaches that will normally work to move an existing library to a new computer.
Method 1
Backup the library with this User Tip.
Deauthorize the old computer if you no longer want to access protected content on it.
Restore the backup to your new computer using the same tool used to back it up.
Keep your backup up-to-date in future.
Method 2
Connect the two computers to the same network. Share your <User's Music> folder from the old computer and copy the entire iTunes library folder into the <User's Music> folder on the new one. Again, deauthorize the old computer if no longer required.
Both methods should give the new computer a working clone of the library that was on the old one. As far as iTunes is concerned this is still the "home" library for your devices so you shouldn't have any issues with iTunes wanting to erase and reload.
I'd recommend method 1 since it establishes an ongoing backup for your library.
Note if you have iOS devices and haven't moved your contacts and calendar items across then you should create one dummy entry of each in your new profile and iTunes should  merge the existing data from the device.
If your media folder has been split out from the main iTunes folder you may need to do some preparatory work to make it easier to move. See make a split library portable.
Should you be in the unfortunate position where you are no longer able to access your original library or a backup then then see Recover your iTunes library from your iPod or iOS device for advice on how to set up your devices with a new library with the maximum preservation of data.
tt2