Nobody prints true blueprints now. Drawings arrive as PDF files, and prints are black lines on white paper. People in the trades still say blueprints, prints or plans for the same thing.
A set of blueprints holds plans, elevations, sections, details and schedules for each discipline. The sheet number tells you which discipline drew it.
A newer estimator should learn the sheet order first. Find the sheet index on the cover sheets. Then learn the symbols from the legend on each discipline's first sheet. Reading plans gets faster once you know where each kind of information sits.