When you are starting to become a fishermen. You need to first ask yourself if your ready for this life.
If you are sure you want to become a fishermen than you must fallow these steps.

Step one: Leave you family behind. (if you have no husband/wife or kids skip to step Two)
Step two: Find a fishing buddy.(that could be a dog/cat or a friend)

Step three: Buy a fishing rod,tackle box, lures, line, hooks and bait, and proper fishing attire

Step four: Buy some beer and boombox with some country music.
Step five: Get a fishing license, and some snacks.
Step six: Find yourself a good spot to start fishing.

Step seven: once you found a good spot to start, cast your line into the water and sit back and crack open a good old beer.
Step eight: live life the way it is supposed to with fishing and drinking

(IF you see im in game come say Hi)