If you're a U.S. resident, you'd enter your Canadian CPP and OAS benefits as though you had received a Form SSA-1099 from the Social Security Administration. See this post for instructions: How do I enter an NR4 Canadian pension plan income code 46 using TurboTax software?
Yes, Here is how to report your NR4 income.
If you paid income tax in Canada, you may claim a foreign tax credit. You would report that here.