Personally, if I go N. Africa, I land with British forces for two rounds, taking Algeria and Libya so that England has more money. As I said, America doesn’t NEED it, they have 37 pretty secure IPC already, England has 12 secure IPC.
As for landings, I find 5 Infantry, 3 Artillery, 2 Armor (37 IPC) to be a good stack. Yes, that’s only 10 ground units a round not the adverrtised 12, but you can easily get 11 infantry, 1 artillery and have 12 ground units as well. I just like my mix for personal reasons. (It’s a math thing, I don’t expect anyone on this board who has not taken MATH 416 Modelling, to understand.)
Obviously, that’s flexible. If you engage the enemy and lose a significant portion of infantry, you can focus on more infantry. Maybe going 9 Infantry, 2 Armor for a round or two to get your infantry back up.
Later you can take all the unspent money and augment your transport fleet so you can jump from E. Canada to Algeria and then from Libya to Caucasus or Trans-Jordan each round to cut the walk time. But that’s later on, after you’ve established a beach head in T-J and later Persia.