Our relationship is done

I know my husband and I are not going to last. We have two girls. I’m at stay at home mom so while he’s supporting us still, I’d like to prepare for my girls and I before I leave. I need to be able to have a good job. I want to go to college or do a 2 year program. What are some quick things I can do to be financially stable as far as working or school programs? Radiology? Ultrasound tech?