HELP - Simple 3D animation : Gift box

[gasper]

Hi there...
I would appreciate if somebody could help me with this one.. I would like to create a simple animation of a gift box falling (let's say) from the sky. The problem is that I don't exactly know what is the easiest and more effective 3D software to do it. I'm attaching a pdf of the storyboard for you to get a better idea. I have never animated in 3D software, but I have animated in flash and am familiar with the basic concepts of animation. I would like to create something appealing, but not to complicated...

Thank you for your help.

G.