What I did for the time is that I just said WHAT I would do so for example my answer could be: The cost will be the time I spend doing this or doing that... for the time I wasn't that specific.
For the cost, meaning money, I tried to find websites. For example, I searched a website for flyers and gave the approximate cost. In my case, I found $725 for 1000 flyers.
Hope that helps!