Both of those doctrines are pretty good, axis is overrated (Pan-Asian is just right).
Depends on a 100 different factors… but generally you’ll want to expand a little less, staying in a general bubble and making safer moves early on. Make sure to get some defensive units-ordinance is key. Use your better resource game to build more industry and R/C’s, you’ll snowball later on. After long enough your larger army should be strong enough to take on better but smaller ones, and you can move out.
Rocket artillery (especially SP), Artillery, milita or infantry, armored cars, medium tanks (only if you are going into the long term, try to avoid melee, AA (I still like interceptors more, though) and naval bombers are all your go to units. Fleets are mostly pointless, and the commie one is rather weak, but if you do get a fleet (really n reason to, just get naval bombers) cruisers are going to be your best friend. Commie air is a little mid, but spamming lots of low level planes and leveling them up later is very potent.
Along with the allied doctrine, I highly recommend skip upgrading with units in this doctrine. Build lots of low level ones, then wait and skip upgrade them, it really pays off. You’ll want to do it quite often to further capitalize on your resource bonus. Remember, just because you have more resources doesn’t mean you can waste them, especially since that gap is made up for often times by Axis and Pan-Asians invading and plundering countries.
Overall, you can’t attack and be a mad man here. Try to turtle and attack at the right times. It may look weak, and you would be doomed if you are attacked early on by an axis player, but once you survive and build up, you snowball far ahead of other doctrines.