Most library systems allow you to search by title, author, or subject headings, and most are cross-referenced.
Don't hesitate to ask for help from your nearby reference person.
Microfiche or microfilm comes in two forms--small cards of information (fiche), or long film-type strips of information (film).
When you get to the section where your book is located, don't just look at that book. Sometimes you will find great resources that you were unaware of just by looking on the shelf.
Because libraries are generally organized by topic, you can often find some real "gems" this way.
If you find articles that you want to take home, you need to photocopy them.