Where can I find a file manager for my 8320 Curve? I want to be able to download stuff onto my computer then transfer it to my phone. Also, does downloading things from your phone through the wifi charge for data?

eFile... from Dynoplex, i believe there is a free verson and a pro version.

On the 8320, if you already have a Media Card installed, you really don't neeed a file manager, just drag and drop those file so your BB, and from the Media icon, open, menu to Explore, and you can open most any files types are recognizeable by the BB.

The thing is, I dont have a media card installed... yet. What is The Blackberry Desktop Manager? Also does downloading stuff through the wifi on my phone charge for data?

You'll need a Media Card. You really don't want a bunch of crap loading up your device memory. This is not PC... with unlimited memory capacity.

The BB Desktop Manager is software which you should have loaded to your PC the day you got your BB. With it, you can backup and restore your BB data, sync data to your PC, etc.
BlackBerry Desktop Manager Downloads - BlackBerryFAQ.com

You want Version 4.2 Service Pack 2; or version 4.3

Ok good ,I started the correct one. Could you please answer my question about downloading stuff through the phone wifi and if it costs data or not?

Not if you have an unlimited Data Plan.

I dont, that means I am getting charged? Even through the wifi?

There is no charge for wifi data.

thank you JC.