Well when deciding what to fish i really take 3 main things into consideration.

1:Time of year. At different times of years different food will be available such as winter, if your tossin a frog, it may work but not thinkin its gunna work as good as lets say a rapala or something to imitate the bait fish which is mostly their food that time of year. So get to know the body of water and what the fish are mainly eating that time of year and go from there.

2:Weather Conditions. Now when its kinda overcast or gloomy i tend to use the bright colors cause it helps the lure stand out more to the fish and when its sunny out i tend to stick with more natural colors cause the fish should beable to see it just fine but that leads me to my third thing.

3:Water Condition. Now if it is a murky area i will tend to use more bright colors to help it stand out more to the fish and if its more clear i tend to stick with more natural colors.

Now im not saying this is what you should stick too cause i know i dont cause sometimes on a sunny day they wont hit natural things and i throw something bright and shinny and they are all over it. Those are just my guidelines i tend to stick to, but im always trying new things cause yoou just never know what will work sometimes.Good Luck