I need a randomized startercharacter, how do I do that?

I know this is a common question, but nobody seems to have an answer that applies to my situation.

So, in this game you play as a custom model of a dinosaur. Because of that, I have no idea if it's R6 or R15 if you're going to ask.

Anyways, I have 3 variations of the starter player model. A pink one, a green one, and a blue one. I want to make it so that when you spawn in, it will randomly choose one of these for you, and give you a different one when you die. However, I want it to stay when you log out. How would I go about doing this? (I also plan on having the player model change over time, aka get bigger. But that's later on.)

(Feel free to ask me for more info if necessary)

Edit: I'm also very new to scripting so please explain it in simplest terms.