First assignments are usually larger than the typical assignment the rest of the semester. Why? Most often its because they want you to read all of that introductory (ultimately pretty useless) information so that you can get a feel for and sometimes a history of the subject matter.
Of course you'll all read it voraciously and take copious notes because its your first law school assignment after all...but you'll soon know what can be read, what can be skimmed and what can be altogether skipped.
Congrats on your beginnings and have fun!