As Germany, the most likely target capital is Moscow but the Soviets can put up an impressive defence simply by stacking around 30 units in Belorussia on their first turn. This requires a three-pronged land attack to overcome:
UK is primary defender of Africa and cannot easily ship reinforcements there, so the UK should recieve the $12 dollars at the beginning. Place an artillery in Malta with the fighter, and a submarine in Gibraltar with the Destroyer. Germany will likely concentrate its fleet clearing Malta, which you can then counterattack with four ships.
A fine first round purchase is Destroyer, Submarine, Transport and units for the transport.
USSR is virtually impenetrable if it employs a stack defence strategy in Belorussia. On its first turn, only counterattack Germany’s opening assaults where overwhelming odds are possible and no strong German tank retaliation can occur (this means most likely in Scandinavia).