New to the Apple 'Newton' Messagepad 2100/2000 Can Some One Help?

So I've just recently discovered the world of the Apple Messagepad. I've been searching for a while now for a pda that best suites my interests and needs. When I came across this old ad for the Messagepad I totally got excited as I love Apple products and seriously loved the look and features that the device boasted. So - now I've put some bids on a couple of 2100 models on ebay and am waiting, I've also found some resellers, I'm definitely going to get a hold of one of these devices. I've done some research on the devices and am concerned mostly with the just how difficult it will be to install software and/or upgrades onto the device from my G5 Powermac. Is there anyone out there with advice and/or suggestions for this Newton Newbie? Any info you can offer me about anything having to do with Messagepads would be surely helpful.

Thanks.