Most decent light fixtures will have some sort of instruction sheet
that will show the proper installation along with a simple wiring
diagram. Also, go to the library and check out some home improvement
books. One caveat is that some older homes do not always have black
and white wires and if the light is 3-way wired it can get further
confusing. In all honesty, if youre not sure how to do a simple light
fixture, get a friend who is competent to show you. Things can go bad
real quick with electrical work when done wrong.