My suggestion? Set up a basic diet but, at first, don’t implement it.
What you should do first is take 2-3 weeks to track everything you eat. Make a note, find the calories, etc.
The reason is that you need data. You need to know what you are eating, what your calories are, and where do they come from.
Sometimes, you might realize “Hey, I drink too much beer” or “have too much soda”. You can change things in a small way but that can kick off weight loss down the line.
Get the data first, learn about what you are now, then make changes.
We have a thread on weight loss right now. You should join when you are ready
Good luck