Ok So first priority is to prevent any German Sealion Attacks. For this you would build Infantry and a few fighters.
You should have about 25-30 income so a Fighter and 6 inf isn’t out of the question.
Once you have secured you home island its time to consider offensive operations.
A good idea is to reinforce Africa ASAP. If you have managed to grab Persia or secure Egypt a factory here is a good way to boost India’s Defenses or annoy Italy.
Amphibious operations against France or Norway can also be considered but this will require many turns investment in fleet building or else the ships will be sunk as quickly as they are built. Typically a decent fleet will need carriers, destroyers and subs to protect the transports.
Typical build might be (
tank + Mech + Inf = 13 (for S-AFRICA)
Plane (str ftr or tac) 10 - 12
1-2 inf to round out purchases
After about turn 5 you will see which way game is going (based on uS pacific v Atlantic focus) Then you can turn your attention to helping India or reinforcing US moves in Europe.