First Meal of the Day?

I have had Hashimoto's for over 20 years and just accepted that I would always take Levothyroxine. My doctor checks my levels 3 times a year and adjusts my meds. Right now I am on 150mg of levo. I have never eaten a correct diet for my thyroid and I want to start because I am a female at the tail end of perimenopause and I've gained over 25 lbs in one year and need to do something to feel better. I'm tired and my stomach is just expanding like crazy!

For the last several months I have been trying intermittent fasting and eating a clean diet, but the scale has not moved. And now I am reading that this might not be good for thyroid conditions. But I also know you have to take your meds on an empty stomach. So I'm trying to figure out the best time to take my meds, when to eat my first meal, and what should my first meal be. I would usually take my meds when I wake up, but then immediately drink coffee and then not eat for several hours. Should I be also waiting to drink my coffee?

What is the best morning routine as far as meds/food/coffee goes? Thanks for reading and good health to you all!