How would I go about relocating to another state with children?

My husband and I are talking about separation. However, I have no family here. I have nothing. But my parents live in another state and I want to move there so I can better my life and better my kids’ life while being a single parent. However, my husband is absolutely against this. How do I go about this? I have another child from a previous relationship. He has standard visitations but again I want to move to another state.