If a source appears credible based on the bibliographical info, what should you do next?
a. create a research plan plan for the source
b. organize the data collected from the source
c. evaluate the content of the source
d. write an outline using the bibliographical info.

If a source appears credible based on the bibliographical info, what you should do next is C. evaluate the content of the source.
First of all, you need to read or watch the actual source so as to get an idea of what information you can use out of it. So, the creation of a research plan, organization of the data, and writing an outline happens after you evaluate the content for the data you may need.