Docpoh, Welcome to AxisandAllies.org!
Here is +1 Karma to get you started off on the right foot.
As far as building a lot of US and UK fighters, I believe that most players feel that Russia is strong enough to fend off Germany/Italy for the first 4 turns or so, especially if the UK is building a good-sized fleet with which to invade France or Germany. So if you put those fighters on Russian soil, then they lose the +5 IPC NO. Probably the only reason one should be reinforcing Moscow that early is if Germay is building all armor units. Most of the people I've heard from, and my own opinion is that all armor builds from Germany in the first 2-3 rounds eventually loses one the game, because you end up trading armor units for infantry units and thereby losing IPCs.