J.S.
As a mommy and a preschool teacher, my two cents is that you wait until he is older, 3 1/2 or 4. 2 is really young to handle all of the stresses that come with daycare/preschool.
A lot of people think kids need to be around other kids young, but it isn't true. Children do no have the ability to acutallyhave meaningful play and interactions with others until closer to 4. Each child is different and this age can vary, of course. At age two, children engage in parrallel play, meaning they simpling are playing individually with a toy next to another child. For now, you are your childs best teacher. If you want to get him used to other kids, join a mommy and me group. Your local parks and rec should have inexspenive choices.
As for bringing in money. First, daycare costs usually negates the money earned outside the home. Throw in gas, lunches out, dry cleaning and there goes the paycheck. If you don't already, really work grocery deals and coupons, shop clearance racks, home cook meals, iron yourself instead of sending clothes out for pressing. There are so many ways to save money as long as you all are willing to sacrifice and make the necessary life style changes.
You will never regret the time you spent with your son.