The library has a number of tutorials that may be of help to you, spanning everything from where to locate materials in the building to advanced database searching. Check them out!
Did your instructor tell you to read something "on reserve" at the Library? Search it in Course Reserves.
Print materials can be picked up at the 1st floor circulation desk. Just give them the call number and inform the desk attendant that it is on reserve for your professor.
If you're working off-campus, you'll need your NEIU NetID and password to access these resources.