Guide to Taxation. Will be landing; getting PR, leaving and back in 2 years

[herculepirate]

I plan to get to Canada sometime this June; obtain the PR, SIN and Drivers License.
1. Do I have to file Canada tax returns every year since.?
2. Can I purchase an under construction property and should this be disclosed/Taxable in my yearly tax returns.
3. Does it mean that if I have a SIN card, I am liable to pay TAX ?
4. There are conflicting rules for getting Canadian citizenship. There is duration of stay AND tax returns filed for all those years.

Thank you.
HP