If you want to work and live in the States or Britain its not as easy as you might expect.
Immigration is a major issue in both these countries with the system being abused on a major scale. Unless your coming from one of the countries they accept as oppressive and offer sanctuary from, such as Somalia, you wont just walk right in
You will have to prove you already have a job to start with and companies in these countries generally have to hire talent they can say cant be found at home, in that case the company would apply for your visa for you.
Even if you do apply for a visa, possibly starting with a six month period, you will have to prove you can support yourself for that period of time as they are very unlikely to grant you a work permit right off, once in the country you can apply for permanent residency during which period you are assessed on your ability to earn a living and support yourself and they will do very thorough background checks on you via FBI records etc, its a very long process which can take up to a year.
Even once you are accepted and granted permanency and a work permit it will be another two years before you can apply for citizenship it would take around 3-4 years in total.
Not trying to put you off but if you are a CEO for a company that develops games which can be sold online they will likely tell you you dont need to be living in these countries to do it.
Britain is slightly different in being part of the European Union where any memeber countries can hire anyone from the member states and citizens can move freely between countries, I could for instance go and live and work in Germany or even after three months resident there could claim benefits, just an example of different immigration laws to the States before anyone jumps in saying "I got half a dozen Polish guys working beside me who appeared out of nowhere", your from China so its not gonna be easy.
It would be easier if you had a relative you could apply through who is already resident in these countries, but the process is the same.
Awesome! Its one of those threads.