First, if you want to use blackberry/RIM branded data applications, you must have the blackberry
data plan added to your account. Period. No getting around it. See http://www.blackberryfaq.com/index.p...ta_Plan_for%3F
On moving/copying files to and from the device, the easiest is to use a microSD "media" card, enable mass storage mode in device options, and then simply drag and drop files between device and computer.
Blackberry desktop manager has modules for managing media on the device, but there are only a few reasons to use it, which may not apply for you.
You mention being able to use wifi at work but not being able to get online ... What exactly is the problem? What is the error message? ... Is the reason for your problem that you do not have a blackberry data plan?