I purchased one a year ago. Ignore the requirements and go to the app store on your device and search for every app you want and install them. I would not recommend buying outdated apps. If the developer allows, it will automatically ask if you would like to install the version compatible with your iOS version. This is called "Legacy App Download Option"
Just remember the app will not have updated/current app features, You will be using old apps with an old operating system so there maybe bugs and performance issues.
App Store now lets you grab the last compatible app version on legacy devices
I would also recommend using the iPad as is for a while. If the performance is acceptable then jailbreak if you want to. This will make it easier to determine if jailbreaking your device caused any performance drops.