Fishing Minigame Randomized?

I am thinking it will require use of called common event, but I want to incorporate a fishing minigame/side activity into my game, and for that I need to figure out first how to randomize which kind of fish (or no fish) bites, then I want to initiate a 'battle' between the fish and the fishing tool, be it a harpoon, a rod, or a net.

Each item has an amount of durability (HP and if the fish 'wins' the tool is damaged and you need to get it repaired, but as you level up in your fishing skill the durability goes up a bit, and you'll learn new fishing tricks to help you catch larger and rarer fish.

Basically, each tool would be a character and when the battle starts it is that tool versus the fish, and if the tool breaks and needs repair, I don't want it to be over, which is doable with evented battles, but the part that I need help with is randomizing which type of fish appears.

Uh, just randomize it?
Let's say there's 5 type of fish. A, B, C, D, E. Assign each type with a number, let's say 0, 1, 2, 3, 4 respectively. Then do a control variable on event command to random a number on a variable, let's say Variable 1, with range 0 ~ 5. If the result is 0 to 4, you got fish with their type correspond with the result. If you got 5, nothing bites.

This is doable with event commands. Any questions?

Oh, that makes sense, lol. Here I was just thinking randomizing within common events but it makes sense with a variable then. I feel a bit dumb for not thinking about that. Thanks