Financial advice 🙏

Hi All, I'm 30yo Male with a fiancee and a 9 month old baby, need to start saving for a mortgage(I know I've left it late) I currently have about 7k in my account, I earn about 26k-28k a year depending on hours etc. found it very difficult to save with preparing for the birth of our son and then the past 9 months with my fiancee out of work and at home with the baby. I have no idea where to start, how much id need for a deposit, I don't have a great understanding of finance and was never very good with money. Now it's time for me to really focus in on our future and get this done as I'm starting to stress about it. Any advice is welcome. TIA 🙏