There aren't a lot of tips to know before going into the game. It's pretty easy to get the hang of things once you understand the controls. That said, the controls may not be apparent at first, but you can find what means what in the menus.
One nice little bit of info is about the animation that plays when you pick your lure out of the water. This can be skipped with the same key you use to cast a line (the default being S), but make sure not to press it twice, or you'll cast the lure back into the water.
Lure colors can be changed with the Arrow Keys, but there isn't a significant change in fish behavior for this to be overly useful. The best lure in the game is the Sonic lure, which is earned through the Original Mode and has an achievement related to it.
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