First Book

Hello everyone. I will soon start my childhood dream of writing by publishing books on Amazon KDP. I have written novels and stories in various genres for 20 years. I have never published them. Now I will publish a book for the first time. The book will be about romance. What advice would you give to someone who is publishing a book for the first time? Frankly, I am very excited and enthusiastic. I want to create something beautiful and create happiness in those who read it. I am waiting for your advice.