yes you get them form itunes
Yes, it will work with both iPod Touches (as long as your iTunes is at least version 8.0 or later). You can register more than one iPod with iTunes.
They don't run iTunes versions. The store, however, is updated according to your current iOS version
Make sure you have iTunes installed on your computer before plugging your iPod Touch into your computer. Once you have iTunes installed plug your iPod in and start iTunes. All the tools you need to manage your iPod and it's content can be found in iTunes. Your question isn't very specific. Feel free to ask another question if you have any further questions regarding iTunes or iPod Touches.
Some basic apps are preinstalled like mail, FaceTime(video calling) reminders,music app(get music from iTunes) videos app(get videos from iTunes) YouTube,safari,iTunes store,weather.", photos,camera,calculator,iMessage(sends texts to other iPods iPhones and iPad with iMessage must me on iOS 5 and up) and a few more. U get other app from the app store. The are free and paid apps on app store that u can get with iTunes cards. Hope this helped!
Yes!! it has the same Username, Two different ipod serial no. Still you can sync your ipod, by marking check or uncheck right side of the song.
welll they all have the capibility to have music in them... u just have to syncronize the music inside of the ipod through itunes or other music websites
yes
yes
They already (2g, anyway, I've never used a 1g) They are located in settings, or in "preferences" on iTunes
Yes they can play mp3s. You just have to use iTunes to put music onto them.
The built-in Music app views and plays music placed on your iPod Touch by iTunes. On unmodified iPod Touches, the Music app icon is orange and has a note symbol.