the three main things you need to hit it big are:
-cash to start you off
-experience
-smarts
you have all of those so just go ahead with your plans to eventually start a new business once you have the cash, just pay all your bills and food/utilities, stash a little in a savings account for in case the worst happens and everything goes to shit, stash another bit to go towards future investments and lastly stash a smaller bit for games and stuff
you may not get all consoles on the day of launch but you'll still have enough for your gaming appetite, you'll have assurance that you can survive even if businesses got to crap and you'll have cash to eventually buy more businesses
rinse and repeat till you have a monopoly of all big Japanese businesses then call us over for a private tour of that new island you bought called Hokkaido