Heyyyy!! So for a beginner, my biggest advice would be: don’t rush your story!! Take your time developing your characters and their relationship, especially in romance. Let the chemistry build naturally instead of feeling like you have to get to the big moments immediately.
Also, don’t obsess over making every chapter perfect. Your writing will improve SO much as you keep writing. Just enjoy the process, experiment, and don’t be afraid to rewrite things when something doesn’t feel right.
And most importantly, write the kind of romance YOU would want to read :) Good luck with your book!! I hope you have so much fun writing it! :D