Applying for work visa

I have been working in Taiwan for two and half years but always do a run back to Europe before my 30 day visitors visa runs out. I pay my tax in UK as a self employed person, but from April 1 will be employed by a Taiwan company.

I need to know is it as easy as they say to simply apply for a work visa at the police station in Taichung and then pay my taxes here.

I have done some digging and cant seem to find up to date information on rates of tax.

What hapend long term, do I simply renew the visa or can I apply for permanent visa after a certain time.

Thanks in advance