Several questions about Vancouver (Richmond)

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Hello All,
I am going to move to Richmond to work as a software developer. Now I live in Russia. It's a very difficult decision for me to rellocate to another country. I have a couple of question about living in Vancouver. Could you please answer them:
1. What is the avarage salary in Vancouver
2. How much should I earn for my living with my wife and a little child? It includes renting an appartment.
3. What are the most problems in Vancouver?

Thanks in advance.