I moved this thread to the "Golf Tips" forum for you. Anyway, the question you ask is one asked by many beginners but unfortunately, there is no right answer. Like Ernie Els. He could hit an 8 iron 180 yards but me, I don't think I could hit one more than 140 (unless wind was aiding me) and I'm not THAT bad of a golfer.

The only advice I can give is to hit the range and figure out your distances for yourself. Then, when you're out on the course, take more club on your irons than you think you need.