Best answer here. Like he said, very unlikely you'll be checked for those things, but do you really want to get caught with your pants down if you do? If I'm ever caught at immigration anywhere and they asked for an onward ticket, I just buy the cheapest one I can on Expedia then immediately cancel when I'm through immigration
Don't go the business route first, spend time here. I think you might be underestimating some of the social and cultural challenges involved in having a business here. Just finding trustworthy and loyal staff is going to be a learning curve.