If I were you, I'd just go for the Working Holiday Visa route and spend a year or two here first seeing if you like the place before deciding if you want to settle and set up business. At your age and with such a large amount of money the world is your oyster so why tie yourself down to one country?? If I had that sort of cash I'd be spending a few years on the road and ticking off as many countries as I could - and to be able to do it in style, veeeeery lucky!
Working Holiday Visas are very easy and cheap option and will get you here in the quickest time. Best of luck!!!