My Planet i started with is Ragnarok, arguably the hardest planet with absurd atmosphere and temperature levels.
firstly, convert all the free GP's to money allowing you to research all the Ores to Rhodium. this should leave you with 3 million credits.
Second, build an outpost and freeball a place with a big Rhodium vein. (if you cant just restart) then start placing other less valuable mines.
Since you dont need a colony to work mines, all the profits will be put straight for the account. once you have enough money, build another outpost. no need to restart as you already have a rhodium mine.
Third, build a bank account. Once a mine runs out, destroy it and put a new one in, (make sure you upgrade the mines)
Fourth, Establish a colony. Place your first colony in a good place and research Hab Domes, start researching and building Buildings in reducing atmosphere as this will be your greatest challenge.
Repeat 3 and 4 till Expenses are getting close to profits. Build more outposts, and build a second Colony.
I currently have 3 outposts making 130 grand each because of perfect rhodium and palladium outpost placements.
fifth, build spaceport and build the Acedemy, using the extra 100% buff solves any problem with economies for almost the whole game.
sixth, terraform the planet, build satellites, BUILD POPULATION, without population you will be 150 real life years old by the time your able to leave the Habitats.
ill leave the rest to you but ill give you the money and pop stats by the time i was able to colonize,
the minimum i could wait was with 2 colonies with 500k each, 5 outposts with 2 main rhodium mines.