Main thing to know: Lighter burns weed, weed gives off smoke, you inhale smoke, you get high. simple as that.

Now to make inhaling the smoke easier you can
a. put it in a pipe, bong, bubbler, etc...
b. roll it in a joint or blunt
c. vaporize the thc in a vaporizer (we will get to this when you get more experienced)

You can also eat marijuana by extracting the thc with some sort of fatty oily substance, like butter or organic peanutbutter (there is more but i dont know much about making weed foods)

some things you might want to know:
-tobacco pipe can be used for weed
-1 gram of good weed can get 3-4 people pretty high
-1/8 = 3.5 grams
-1/4 or "quad" = 7grams
-1/2 or Half O = 14 grams
-1 ounce = 28 grams

thats some of the main things you should know, i will post more some other time.

edit: damn, nochowderforyou beat me