If you have income above the filing threshold but less than the exclusion limit (currently a bit more than $90K), you want to simplify your filings to the extent possible.
Do NOT use the Canadian taxable income figure. For your US returns you have to declare your gross income (i.e. before any deductions or adjustments) from all sources worldwide. If your primary source of income is salary you should probably first fill out form 2555 (EZ if possible), where you list your gross salary income, then apply your foreign earned income exclusion. That should eliminate your salary income from taxation altogether and at the end of the form they tell you what numbers to put on which lines of the 1040.
If you do it that way, then you don't need to bother listing any expenses anywhere, because your tax is -0-. If you have interest income or income from any other sources, you'll need to declare that, too (and that income isn't subject to the exclusion) - but just follow the instructions line by line over to the second side of the form 1040. You get to subtract your personal exemption and your standard deduction, which should bring your total taxable income for the US to -0- and you're all done.
If you have bank accounts outside the US with a total of $10,000 or more, then you'll also have to file a Schedule B with the appropriate boxes checked off at the bottom of the form and you'll be expected to file an FBAR form with the Treasury, listing your bank accounts and their high balance for the year. (Don't worry too much about this - a good faith estimate will do. Bump the amount up a bit if you're not certain. The information on the Treasury form does NOT result in taxes due and they will hardly hassle you for overestimating your bank balances.)