I’m no expert on the game. I played for a week or two last summer, and haven’t found a playing partner since. That week, however, was an instructional class on the game. Anyway… to the point of helping you…
My experience with Germany has been that you’re small, but powerful. You basically need to explode into the other countries like that snaps fingers. Don’t worry too much about Defense, and in the future, don’t buy an AA gun, you should already have it, that’s all you’ll need.
As for your next turn, buy maybe 1 or 2 tanks, and spend all the rest on infantry. You need a big army, so you can explode into Russia.
However, Russia might not be that smart either, since it’s their first time too. But you need to attack russia, go straight for Moscow, and take it out. As for the other pieces that cannot make it there with the rest of the bunch, you have two options, back them up, or go for some other countries and get some more IPC. The second choice is what I would do. You need to get at LEAST -30-32 IPC going if you even want to have a chance.