You can do either, the difference will be the speed with which the entire pile turns to compost. If you turn it every couple of months, it will take a lot longer for the inside of the pile to breakdown. If you turn it more often, the entire pile will uniformly turn to compost and it will occur more quickly. Not sure what your area is like, but we don't add table scraps to the pile out in the field because it attracts all kinds of critters including skunks. You might reserve that for a compost container up close to the house that you can restrict access to. Table scraps don't add anything to the chemistry of the composting, you have the two required ingredients with hay/grass/straw and manure.
...so do I turn it once in a couple of months our a couple of times per week. We typically don't have table scraps to put in it, just the hay waste.