Heather and Willie's Baby journey

Hello my name is Heather and me and my husband Willie really want to try and have at least one child together. I am a mother to amazing children but before me and my husband meet I tied my tubes thinking that was it until God brought him in my life. My husband is a great father to my children and he has always wanted one of his own ? Even though he knew my tubes were tied and the chances of us having a baby would be probably impossible with our financial ability he still married me and has been a great step father. We both know time is running out due to us getting older and want to at least try before it is to late. It would honestly be a dream come true for us to try and make this happen and appreciate anything and everything anyone is able to help us with from the bottom of our hearts ?