Scheduling

Hello, everyone. I am graduating in 15 weeks and have to get a position as a new graduate. My concerns are in scheduling... I have two young children (a Kindergartener and a preschooler). They rely on my 100% for their care. I don't have family to help me out and my spouse works a rotating shift and every other weekend. I'm finding that hospitals all want to hire people who can work every other weekend and rotating shifts. For me, this simply isn't possible. There would be no one to care for my kids. I was planning to accept a position in the OR, which offered 7-3 for a year and then every 4th weekend and 4-5 "off shifts" per month. This is a workable situation for me, but I have heard a LOT of people say that it's imperative to work on the floor FIRST. I plan to continue to grad school and earn my MSN, most likely as a NP. Would I be missing out on necessary skills if I go to the OR? I am desperately nervous now about accepting a position, but feel that my hours are so limited and PRN is not an option as a new graduate, nor would I be comfortable working so infrequently.