Where are you located?
Do you normally work in inch units or metric units?
Didn't your professor cover thread nomenclature before giving this assignment?
.5 inch is the is the major diameter of the thread
13 threads per inch (or 1/13 inch crest-to-crest)
UNC Unified National Coarse
4.00 inch length from end of bolt to clamping face of head.
Use the threaded Hole feature tool to get correct tap drill sizes for holes.
Use the Toolbox to get the bolts (make sure to get local copies in you assembly to avoid confusion).
Post your assembly here if you still can't figure it out (this sort of topic should be covered before assignment).
Attached is a link to a webstite with some good basic information:
Hole Wizard Settings will be along these lines. Holes are now "THRU ALL" but you can change them to a "Blind" hole if needed.
in a 1" thick plate this can look like the following.