I've done this before, it works quite nicely, though there can be a few little problems its pretty easy to do.
1. No, the mouse slips over the screen when you go to the right hand side of the screen. So, 1 mouse for 2 screens.
2. Yeah, you can drag the items onto your second desktop if you wish. Since mine isn't always connected I don't but you can do it. Provided you have turned on the option that allows you to move them.
3. Its based on the audio your computer is outputting, it only transfers video, not audio. So any audio will still come out of your computers speakers. If you want noise to come out of something else then you'll need to connect it to another device with audio cables. (so that means it shouldn't be a problem for what you want to do)
4. Getting programs to run in full screen on the other monitor can be a problem, however you can easily switch the screens from 1 to 2 quite easily, so if it will only maximise on screen 1 and not screen 2, then you can switch them around so the second screen is number 1 (according to the computer).
If that doesn't work, you can always go "Duplicate Display" meaning you would have Sims on both screeens
Different screen sizes might be a hastle if you have them on the table next to each other but if your using something completely different, then it wouldn't be a problem. So, check the resolution and display size of the new monitor before you get it, also, make sure you check your computer can handle it, any recent-ish graphics card should handle it.....worst case you take the new monitor back.
For example. I can connect my 17 inch computer screen to my 42 inch hd tv, they have slightly different res and very different size... however it also means I can watch all of Astroboy... or play any computer game is giant vision.
Good luck with it, if you have a problem, post it
