If you're a school, Apple has a trade-in program for educational institutions you could look into to upgrade to newer iPods:
http://www.apple.com/education/docs/Apple-Trade-InProgram.pdf
Otherwise there's nothing Apple could tell you other than sell the iPods or find a reseller willing to accept them on trade. A first-generation iPod touch will not run any version of iOS later than 3.1.3, and a second generation iPod touch nothing later than 4.2.1. There are still apps that run on those versions, but they're getting fewer and fewer. Getting newer iPods is going to be your only avenue to being able to run more current apps. And if you do, I'd advise expecting only a two-year lifespan out of them, at least as far as keeping up with the latest version of iOS and apps is concerned.
Regards.