what I prefer to do is this;
3 inf + 3 tanks on R1, hit ukraine with 2 tanks 2 planes and 3 inf, everything else on west russia, stack bury, and mover everything else west. turn 2 I prefer to buy 1 ftr, 1 art and 5 inf, this is to be able to scirmish on a front that is 3 terretories wide.
on UK1 my first priority is to retake egypt if possible, to do this I use the bomber, the india ftr, 2 inf from india, 1 inf from jordan, this should usually at least be enough to kill all the german units, even tho you lose all your infs (depending on defending luck turn 1)
I usually land in algeria, because germany are usually not capable of counterattacking the combined UK an us fleet, If this is not possible, gather the fleet west of UK with my new AC.
if for some reason germany has done a quite common mistake to only have 2 inf and 4 ftrs in france, I attack it, if egypt is not possible i often land in borneo and papua, while using the ftr + sun against j sub, and land the ftr on pearl.
US will usually buy AC + trs + inf/art tanks (if I buy 6 units it will be 4 inf 1 art 1 tank, and long game, more tank than art)
the overall gameplan from this point will be for US to land 8-10 units in africa each turn, UK build 6-7 units + 1 ftr and at some point swich to landing in norway, when strong enough. USSR keep on scirmishing germany.
If I have a successful game, the US in africa will make it to persia, and be able to match the japanese there, possibly making it to cauc. I once had more than 150 units in cauc, only 50 was ussr. then the win is plain.
if japan manages to be fast enough, I will move all my us trannies to the med (8-10) and start landing the units in africa in s europe (16-20 / turn). I will lose it a few times, but germany will not be able to build more than 10 units / turn, at the same time UK will land in france each turn, and if USSR are not able to hold moscow from the japanses, the entire russian army will start walking towards berlin, doing a final suicide charge to kill german units.
I have had a more than 80% successrate with a bid of 8-10 (set in libya) with this stratigy.
on, and people seem to forget that trannies are prolly one of the best fleetunits on defence, UK/US fleet is often 1 BB 1-2 AC 2 DD and 10-12 trannies. you need a pretty good attacking force to deal with that. And that is before you add the ftrs on defence.
btw, I also 400 games in an insane amount, with some intelligent research, and planning, you should be able to figure it out in much less, especially playing online.