the best is you get rid of skin and seeds ( i used a "squeezo" strainer) and add a few leaves of basil to each container Plastic for freezing glass jar for canning, then either freeze or can this tomato juice. You boil your tomatos a bit and put through strainer of your choice.
When ready to make sauce - saute a chopped onion,finely chopped carrot, and celery, add chopped garlic, basil and parsley, add your San Marzano and adjust with tomato paste. With SM might not be necessary. Salt pepper to taste and 1t sweet paprika.
Meat sauce: brown some ital. sausage and a piece of pork ribs add the above (omit celery and carrot).Let simmer for about 1 hr.Add your browned chopped meat the last 10 min. for baked ziti or lasagna.Add baked meatballs cook another 1/2 hr.