Use the below sources to help discover legislation and get an overview of the context in which it was enacted.
Use the below databases to obtain digital copies of congressional documents.
Tracking a bill through Congress can be exciting. The following links will allow you to track current bills, though there are many other similar sites and tools on the internet.
Trying to figure out what was influencing Congress is a goal of many researchers. The following databases will allow you to search for articles and books that will provide background and context into Congressional actions and proceedings. For current issues, another good source to check are the major newspapers (Washington Post, NYT, etc). Also consider following groups on issues you are interested in--many of these will put out statements on about/for/against legislation.