When I worked with children I worked with therapists with a master's degree in social work who provided services to the children I worked with as well as their families. They made in the low 30,000 range and put in far more hours than 40 a week. Working for a private company you could do better, but some require you come up with your own caseload so it can be inconsistent.

If you do go for social work, I would recommend a state college. They are cheaper (you don't want to have to pay back $80,000 in school loans on a social worker's salary) and I feel provide a better education than many private schools for social workers as well as more exposure to a culturally and socioeconomic diverse field.

If you have more detailed questions for me, feel free to PM me.