You definitely don't need a blender to make pizza sauce. In fact, it's often not the best choice.
Your really don't need any equipment. Crushed tomatoes often make great sauce. They are made from the ripest tomatoes that are too soft to can whole. I've tried several brands of whole peeled next to their crushed counterparts, and the difference in every case has been stark. Down the road, if you find you don't like the skin bits in the crushed, you can easily separate them with a food mill. They don't seem to bother most people however. I'd suggest a can of crushed tomatoes with just a pinch of salt and a dash of oregano. Nothing else, and no cooking. Simple. Less is more with pizza sauce. The sauce will cook plenty as the pizza bakes.