how many sources scholars use as evidence in their research
As you follow citations and see all the research that is used in one scholarly paper, you begin to see how scholars work across disciplines. The large number of references scholars use reflects the need to show how engaged and knowledgeable they are about their topic areas and the research conversation done within it.
How prolific or dedicated scholars can be to what you perceive is an obscure topic
Scholarly research can be very focused. Each piece of research fits into a larger web in the scholarly conversation.
how much info Google Scholar has / what it can do
Google scholar is good for following citations from a known item - you have the title and author, for instance. It is not great as a discovery tool, in helping you to find research about a topic. This is because the search doesn't allow for much narrowing.
Not everything in Google Scholar is scholarly. But, it's a great tool to use as part of a broader search strategy.
What questions you had:
How do I cite?
There are hundreds of citation styles and they are specific to the disciplines you see them in. Each discipline decides what the most important information is in the citation and builds the style from there. Additionally, some disciplines tend to cite a certain type of information (journal article, book, site report) more than others. As such, they need to construct a style that is clear and consistent for the audience.
If you are having trouble citing, use a reliable citation manager like NoodleTools. EasyBib is an option, but the autocite option is often inaccurate. I also like pulling citations from the databases themselves, when available.
If you are every having trouble differentiating between a journal and book citation - try searching for the citation in google scholar or on the library homepage.
How do you find articles for your topic in general?
Use the Databases I Recommend page at left. The databases are good at allowing you to search specifically for broad topics. The Libraries provides access to about 800 databases, all with different info. As you become comfortable within your major, you'll find you'll only use a small handful.
How do I know if something is credible?
This is a good question with a complex answer. What is credible evidence in one research question can be irrelevant to another. Consider the authority and expertise of the author - is it relevant to the questions you have about your topic?