Okay... Do you have any transparent colored paper? This is a very simple 'experiment' that will hopefully tell you a bit about evolution. It's nowhere near as detailed as it needs to be for you to properly understand it, but hopefully it'll open your mind.
Take a certain color, and put it on the ground. Now, let's say it has a baby- so layer another color on top of it to represent what the other parent looks like. The meshed color is what the baby looks like; a mixture of the two parents. It's not identical to the previous parents, but it isn't entirely different as you can still see what colors you put together to make it.
Now let's have THAT one make a a baby; but this one needs a mate, right? So take two other sheets of paper and place them together- that's the one our first paper will mate with. To see what THAT baby will look like, layer the four sheets on top of each other.
See? Now the color's quite different, but if you peel back the layers, you can see what colors make up the one you see now (and that's how we study evolution: we 'peel back the colors', and see what they can tell us about the previous generation).
If you continued this for millions of years, who knows what kind of colors you might end up with!
And if you were to redo this experiment, starting with the same colors, you might end up with an entirely different color as you layer them. That's how new species come about; they started the same, but as time went on the layers started to make them look (and act) very different.
Now that I think about it, this isn't taking into account all of the environmental changes that could affect the evolutionary process, though I suppose you could simulate that as well.
If you were to make two stacks, one with heavy books sitting on the pages every few pages or so and one without, then you placed a fan into the room, the one that blew over would be a species that couldn't survive under those conditions. So they would die out, and the heavier stack would be the species that continued to grow! The species with the heavy books (what might be known as beneficial mutations) would be able to go on.
Now, keep in mind, this is a really, really, REALLY simplified 'explanation' of how evolution works. If you want to learn more, there are many informative places I could direct you to, and I'd be happy to.
Contact me here if you're interested: firstname.lastname@example.org