Stage 1
Take over Australia, tell New Zealand they're becoming our 3rd territory and to deal with it, here have delicious Australian prices for all of your stuff. No more $140 video games.
Increase military spending by a large amount, build forces, buy a bunch of new shit from the US
Wait 5 years, buy as many old SR-71s from the US for 'Research' as possible
Adapt SR-71s to carry a MOAB each and see what (if anything) needs to be modified for sustained mach 3.5 flight
Proceed to take Indonesia, Singapore and Malaysia (likely without fighting too much)
Wait a few months, calm tensions claiming humanitarian reasons, improve condition of life and economy of said countries enough to be realistic
Proceed to take the Philippines and give Vietnam Cambodia in exchange for becoming an ally
India and China would both likely be looking pretty hard at us by this point, so proceed to offer the peaceful solution of splitting up Myanmar/Bangladesh/Laos between us while Aus takes Thailand
Stage 2:
Start subtly stiring the embers of a revolution in China, cause the armed forces to be divided
Obtain enough evidence for the rest of the world of abuse to the peaceful chinese citizens by the government
Proceed to assist rebels openly with powered suit soldiers called spartans, keeping the name alive, send in the SR-71s to take out high value targets and egress before a decent response is formed, do this enough to wear down the Chinese military strength.
Specifically target any facilities housing nuclear weapons to disarm the chinese government of them
Call up the US and be like 'you up for a decent fight for once?', wait for the 'FUCK YEAH's to die down then get them all up in there
Tell India that we'll be bros but you gotta cut back on your pollution, here we have some job openings in Yunnan
Stage 3
Start Australian space program, start good relations with NASA by providing them with things they'd never have the funding for
China now (hopefully) run by new government who's totally cool with the Australian Combined Empire (ACE is just better as an acronym)
Start trading, exploit for own needs, obtain tons of money, send oil and cheese to the US
Peace for next 5 years
Establish permanent base on the moon and mars.
Start mining asteroids
Let things be peaceful for a while
Start attempts to terraform mars slightly, establish more bases
Possibly another 5 years of peace, sell Thailand to China/India
Use money to establish permanent colony on mars, aim for 1k-2k people
Establish Space Command
Give moon base several 100mt nukes, hold the world hostage while i'm not on the planet
Listen to them tell me i'd never be that insane
Ask if they've noticed the withdrawl of as many people as possible from Thailand/Vietnam/Malaysia
Proceed to send 3x 100mt nukes and destroy India entirely
Start referring to myself as God King, demand a statue in the capital city of every country on the planet within a week or i destroy it
Proceed to set up secondary colony on mars and release information from the various probes sent to other earth-like planets and pictures of the first mars colony which looks incredible, then show the launch of the Songlark, a ship capable of ferrying 5000 people for up to 30 years at near light speeds.
Now no longer need earth
King of Earth
Establish UNSC, offer $100bil reward for discovery of useful FTL
Die
Year 2525
UEG Agriculture World: Harvest...