Make a shortcut to planetside.exe on your desktop. Go to properties and edit the target line to say
"C:\Program Files\Sony\PlanetSide\planetside.exe" -off
... or whatever your path name is. All you should be doing is adding -off to the end (and you need the space after the " ).
Launch that and you can get to training mode.
Btw, trainging lvl 2 is messed up, so you can only use the first lvl correctly. After playing the first lvl, (it's boring as hell... you've been warned) there's a file that can be hexedited to get to the other lvls, though I forget what it is. Something like training.ini or soemthing. Anywhat, there are only like 5 values in it. Change the first one to 09 and you can access the rest of the sections. I haven't tried this and don't condone hexediting your files unless you know what you are doing, especially with beta code that isn't released.