try going aa at gb2, if you can manage to shoot down even 1 scout and your team wins you can get around 5k-8k+ exp

for aa guide try visit this sites

http://www.nf-guides.com/
and
www.trainworld.us

or you can load some HH and kill some subs. If the sub doesn't crash dive then you can easily get around 20k atk from one sub

i would rather go aa, it does help a lot, free expert ^^, nice credit gain, faster way to level, 1 win in gb2 = 2-3 blitz xp

i dont know all these terms whats GB2?

GB2 = great battle 2.
It's a type of gameplay room - pretty much everyone from level 1-120 can play it.
You might want to stick to blitzkrieg though -> the green type room. Levels are limited
from level 1-60.
AA= Anti Aircrafting is done predominantly in Great Battle 2. Great battle yields most XP even if your
contribution is low. Just get some sort of attack on another ship to get shared XP.
Blitzkrieg will allow you to "fight" on a more fair level with players near your own level but
XP gain might be lower.

the general rule of thumb is ....

play BLITZ for creds and points ....
play GB2 for more xp and faster leveling ...

ahh ok thanks guys. helps quite a bit

and what ship is a good torpedo spamming ship?

Torps are mainly IJN territory but depends exactly what you want to do. SN has a short safety range so one
way torp rushes work well there. Since you're on the USN line at the moment ~ quit torping ASAP.