What to do with Tomatoes?

A friend is growing his own tomatoes, and found himself having literally several tomatoes. He game a few to me, to use at my own discretion.

Now, obviously, I could just eat these as they are. Slice them up, use them in a salad, in a taco, or what ever. But I thought I would use the opportunity to make a completely home made tomato sauce. Not entirely sure where to start, but I'll figure something out. So unless anyone have any objections, these will be sauce by the weekend.