If you are living in Singapore and reporting your income in Singapore you will need to create a business or a company. Doesn't matter whether you are bricks and mortar or internet. What matter is collecting revenue in Singapore as a business.
Yeah, the appropriate channel is to register as a sole proprietor if you are running the website business on your own. Registration and Exit of sole prop business is also fairly straightforward so no harm to do so too.
Potentially moving to Singapore in January and although have a good handle on most questions I would be grateful for a couple of answers to things a...