I make salsa in 20 pound batches... So I don't know how to make just a little. It depends on what I have in the garden.
I seed and dice plum tomatos, and add 50% or so of the volume of tomatoes in sweet peppers. I love peppers, as many different kinds and colors as I have. Pimiento peppers work really well in salsa, for some reason. A few pounds of seeded and chopped jalepeno (I like to wait until they get red on the plant, like a sweet pepper - you never find them that way at the store). A generous amount of diced red or yellow onion, more garlic than i think I need, and usually two or three big bunches of chopped cilantro for a big batch. Sometimes I whirr everything through the food processor, sometimes not, depends on what i want to do. That gets heated on the stove to a simmer, I add some vinegar ( a few cups), and can the salsa in pints in a hot water bath. The vinegar is to get the acidity up for canning, you can leave it out if you are freezing the salsa (which also works, but the texture is better if you freeze the finely chopped salsa).
Mildly spicy, but not scary. If I want scary I add habeneros...