2.how well will the beta run on my system?
Windows xp
2.8ghz pentium D
ATI radeon 1500xge 512Mb
3gb ram
Should be decent.
3.what is the difficulty/ learning curve
"Easy to learn, hard to master". There are several poorly documented features, but you should pick it up quickly enough, especially online.
4.is it actualy worth pre-ordering and downloading the beta
YES!
This game is fun, even in its beta state, and its more stable than most
released games. Not to mention more fun!
That said, you also get to help
shape the game -- I have fun hunting down bugs and helping the devs fix them, you may too.
EDIT 6. is the camera a stable camera u move up,down,left,and right
or do u rotate and move the camera (like in World In Conflict)?
I generally use a static view
angle, but one of the huge benefits of the current UI is that it uses infinite zoom -- you can zoom out to view the entire map, or in to watch a single window on a capitol ship (not that I recommend doing the later... the models aren't that interesting

)
That said, you can rotate and adjust the camera to your hearts content, as well as zoom in and out and pan.