I am 21 5'6 130 lbs.I am looking to gain about 20-30 pounds and was recommended testosterone 250 from a friend. I was wondering what kind of side effects I could expect if I were to use 1-2 8 week cycles?

Consult your physician. There are better ways to gain mass without resorting to drugs like that.

For starters, exercise. Lift weights. And eat a healthy diet high in protein.