To find out, read The Bible. In addition to reading The Bible, you may also want to listen to the following sermons:
"The chief end of man is to glorify God and to enjoy him forever." - Westminster Shorter Catechism
"And this is life eternal, that they might know thee, the only true God, and Jesus Christ whom thou hast sent." - John 17:3
If you are interested in such questions as "What is the chief end of man?" (and I hope you are!), please take some time to listen to the following Gospel sermons:
What is the Chief End of Man? by William Boekestein
When Government Tries to Be God, by Dr. David P. Murray
Recommended Gospel Hymn:
Please Search the Book Again, Mckenzie George and Bruce Willey
