Regarding the investment and management VISA- JETRO has recently publicised that the capital needed to start most types of foreign company in Japan is only 1 yen now. This makes it a little more accessible. However, you'll still, more than likely, need to invest in an accountant or lawyer to help you set up the business, and there are significant costs involved in the application process. More info can be found at
http://www.jetro.go.jp/en/invest/set...setting_en.pdf