Hi alecug,
Hey, we were all new once. ;)
A list of acronyms that are thrown around this site quite a bit can be found here:
http://www.axisandallies.org/forums/index.php?topic=27430.0
I hope you find that info useful, and welcome!
If Japan attacks USSR turn 1, does that bring Germany and USSR into war?
If Japan attacks USA turn 1, and Germany/Italy did not attack the USSR turn 1, can USA land planes in USSR turn 1?
No
Not unless USSR and US are at war with the same country, I think
If Japan attacks USSR turn 1, does that bring Germany and USSR into war?
No.
If Japan attacks USA turn 1, and Germany/Italy did not attack the USSR turn 1, can USA land planes in USSR turn 1?
No, because the USSR is not at war with anyone.