You may find it helpful to refer to these reference sources for definitions and context for both the issues involved in your bill as well as legal language, congressional procedures, etc.
Here are a couple of other suggestions for sources to use as you begin to explore a topic. CQ Researcher is a great source for current events topics.
The Library also has several book series:
which are also good for beginning some research as well as exploring a range of possibilities for research questions and argument theses. I've linked to examples for the book series, but you can search for your topic in the catalog as well. Here's how: