Did you get started? Construction requires Marble and Granite for sure. So look at Ontario. Let me know if you have questions. My email is wegupta@gmail.com
Accounting rules will say that if you include the spouse you include their income..so my take on that will be to fill two forms, one assuming you were always single and 2nd doing an average for family size in a year. And make it known that you are submitting two forms and this should be evident...
15000 will give you other income as well...while they are looking for employment income...so if you sold your house and made 500K, it will increase your 15000, but that is not a repeatable income. If you have no other income then 15000 shall be OK