If I where you I would start with MVP based on a finetune gpt 3.5 turbo. That way you’ll get something down fast with good quality. Going on azure ai studios will be much more time consuming and expensive - In my opinion its suited for a later stage of your idea.
You can fine tune gpt-3.5 easy and effectively here is a guide
Also I developed a free web app to quickly create curated jsonl datasets for fine tuning. You can check it out here. Let me know if you like it!