This verse also talks about the Great Commission, which is "go and make disciples" (Matt. 28:18). God also talks about discipleship here, but in different analogy. He compared it to a fisherman. For us to disciple and win souls for Christ, He will teach us to catch men instead of fishes.
How to be a fisher of men? Believe in Him, accept Him as your personal Lord and Savior. Also, walk the same path of life that He walk. Have a character like Jesus so that people will also see Him in you as you minister to them.