If I invested in stocks this year through a TFSA, should I say yes to this question"did you have income from investments such as interest earned on investments,"?

Generally, interest, dividends, or capital gains earned on investments in a TFSA are not taxable either while held in the account or when withdrawn.

If you have TurboTax Live Assist & Review, here is how to talk to a Tax Expert: https://turbotax.community.intuit.ca/community/navigating-turbotax/help/i-m-using-turbotax-live-assist-review-how-do-i-talk-to-a-tax-expert/00/873764