I'm scared.

Lena
Hello everyone, this is my first time speaking about this but I'm honestly scared. I have no children and my husband and I have been married for a little over three years. Prior to me, he has one son but decided he wanted to get a vasectomy. Recently we spoke about the possibility of having kids and now he has scheduled himself for a reversal. 
Well I'm nervous and scared. I don't know if I'm ready. How do I start planning? How do we get financially ready? So many questions ... help