how do I print on a network non airprint printer?

same way you print to a windows printer with a pc without installing a driver for the printer....

search app store for an app for the printer or buy a printer which support airprint are your ownly options

Unfotunately AirPrint enabled printers are the only ones that are officially supported.

If that's not an option, you can install the Print app ( http://itunes.apple.com/us/app/print/id402619806?mt=8 ) which has intructions and support for enabling other printers. The only other option is to Google AirPrint service if you feel up to some advanced steps. Doing that requires your Windows computer to be on and your printer to be shared on the computer.

Google airprint activator

Try FingerPrint. Here's a review. Here's the site.