Hi Naoto, From your questions, I understand 2 things:#1 : Your background is in Accounting#2: You lived in Japan and Thailand. You can start a business in the accounting field or in the trade between Japan and Thailand. Maybe some businesses in Japan want to have local representatives in Thailand. Or, in the travel industry, some tourists from Japan want to visit Thailand and need the help of Japanese who have been in Thailand before them.I would suggest you contact Chamber of Commerce in Thailand and in Japan. You will be amazed with the number of opportunities and resources they may have. Hoping this rough ideas help. First identify if your business will be related to accounting or to your international experience, or even something else.
Instead of simple translation you really need to localize the copy for the market as the other answer stated.You should also have a plan in place for Japanese customer service - as Japanese consumers demand a higher level of customer service.www.executivesjapan.com
From a distance (i.e., I know very little about crowdfunding), I'd say that you may face a meaningful competitive threat from Kickstarter. Or, rather, you will likely face a competitive threat if it turns out that this is a good idea. Kickstarter (and to a lesser extent, other incumbent crowdfunding sites) is where people go for crowdfunding opportunities.