A Research Guide to Congress: How to Make Congress Work for You, by Judith Manion,Joseph Meringolo, and Robert Oaks.. REF KF4950 .M36 1991.
Although out of date for online materials, this is the definitive source for researching Congressional materials and is still relevant for research using print materials.
How Our Laws Are Made, by John V. Sullivan, Parliamentarian, U.S. House of Representatives. Also available in print, Y 1.1/7: 110-49 Law Library First Floor, Range 110.