It wouldn't hurt to start exploring the process. To self publish or not self publish is one of the biggest questions a modern writer needs to clarify for themselves. Both have pros and cons. This exercise might give opportunities was you to know which direction is right for you. There is a lot of work involved once a book is written. My best advice is do not write a book, wait, wait, I am not discouraging you! I would say write from the heart. Write moments, write the places in the journey that meant something to you. Write the stories, the lessons, the feelings. That is what people want to know, need to know and what you want and need to share.
Your inner editor will say you must record everything and it must be chronological, but you know that the best stories/books never start with, "I was born in the summer of 1934. My sister was born in 1935. My brother Edwin,..." You get what I'm saying. Start with writing about the things that matter to you and let it take form. The best writings reveal just a bit more than you are comfortable with sharing. That is a quote from Neil Gaiman. The has a great writing course on Masterclass.
So what I'm saying is that writing a book can be an overwhelming task. Write your truth instead and you may well end up with a book. Maybe it lends itself better to stories or magazine articles but whatever you do, I'm cheering you on.
Steph I pray that you take comfort and purpose in your writing and this journey. Bless you as you go, hugs, Laughingheart.