I came here gun ho to be the best English teacher ever and make the world a wonderful place. After 3 months I realized that that system is just a grind house. Luckily I saved the rest of my salary, next year I swapped to a student and studied Chinese for about 2 years, after that I dropped 300,000k into a restaurant start up. Failed miserably. I wanted to stay in Taiwan because I like it here but not wanting to teach English and majoring in English I decided to give software engineering a shot.
Got accepted to a good University here, after 3 days I dropped out. Studying in Taiwanese universities suck! I spent a few years learning software engineering, started up a company back home. Setup a rep office... search for the 2011 updated guide. Got my 3 year ARC and now I'm sitting pretty. Software development is hard but the income is great, no bosses, do whatever whenever and no need to worry about visa runs.
You already speak Chinese which is good, I wouldn't recommend you come here for a job or career. It's just not what westerners are used to. The working environment sucks and you get no respect but everyone just kinda goes along to get along. That's what my local friends tell me. You could teach English here for 1 year just to have some stability for a while, get to know the place, learn the lingo, pick up some Taiwanese and just see.
Its easy to have rose colored goggles when your looking from the outside but Taiwan can be strange sometimes. If you get hooked into the system its like being on a roller coaster the way you'll get whipped around sometimes, while other times, its like watching paint dry.
I've been through/am going through a similar experience. I taught for several years, spent 1.5 years studying Chinese, speak, read and write Chinese now, didn't try starting my own business, but did apply to a Taiwanese university, was accepted but didn't go. Now I'm back in the States, have been accepted to a university here, and am studying programming. Unlike you, I'm fed up with Asia and will not be going back. Since so few people successfully get out of teaching and start their own business in Asia, maybe you should tell us more about it, including a link to your company's website? At the risk of sounding cynical, considering how difficult it is to do what you've done, some proof of your claims would be nice.