Re: a beachhead in Java, I have never seen the IJA invade at Semarang [did I get that right?] about half way between Batavia and 'baja, but it seems like a good place to split the defenders and prevent a fighting withdrawal from one major port to the other. From that central location your fighters could cover most of Java.
Re: Rangoon, the usual strategy is to land at Akyab and march inland to cut the rail to Mandalay. After that happens no supply will flow down the Burma Road because there is no input from Rangoon. The cut-off defenders can be eliminated when you get enough troops from Malaya, DEI and/or SOPAC.
You will need to decide whether you are going onward after Burma or stopping to entrench and build forts in the favourable terrain.
Going after India against an experienced player will get you bogged down before you can consolidate and build up Burma.
Going after Australia risks your navy when the Allies get reinforcements. Lose control of the sea and any troops in Australia are cut off.
There are too many islands in the south seas to build an impregnable line of resistance - he can counter-build faster than you can and use LBA to attrit your islands. Again, your navy can only prevail in ther area until late 1942.
So, to me, the choices seems to be:
- establish a strong line of resistance early and conserve your forces to slow the Allied return [a Japanese "Good Sir Robin"]
- force major battles to devastate his navies in 1942 [very difficult against a skilled player]
- make a major "Phase II" move to make the game more interesting, knowing it will use up a lot of your assets and hasten the Allied advance
The question is "Do you feel lucky?" [;)]
Rotsa Ruck!

No matter how bad a situation is, you can always make it worse. - Chris Hadfield : An Astronaut's Guide To Life On Earth