YES i have one and have about 100 apps
Any generation of the iPod touch can upgrade to the latest firmware (the first generation iPod touch cannot be upgraded to the latest firmware, but it can be upgraded to 3.0 which does support apps) The first generation that supported apps without an upgrade was the second generation.
No the iPod Nano does cannot use apps.
The iPod Nano will not run apps.
yes it can.. it only has the apps that came with the ipod but you cannot download apps like you can with the ipod touch.
Yes.you can but you have to have an account to get apps and since you have an iPod touch 1st generation you can't get every app
Yes. See the related question for more info.
The 8th generation iPod Nano is something of a mystery and nobody knows what it will or will not do. We do know that the current iPod Nano (6th generation) will not play movies or run apps.
Yes. Every iPod Touch and iPhone, can use apps.
No
You can buy free texting apps from the App Store, but the second generation iPod Touch does not come with built-in texting.
The second generation iPod Touch does not have a built-in microphone, but you can connect the new iPod earphones with the controls, which does have a microphone and will work with the second generation iPod Touch.
Only iPod touches and iphones support apps.(If you are wanting apps get the ipod 4th generation. "Walmart does not carry Product yet though.)