How to make a Vocal synthesizer program on Python?

[Seadust]

I'm making a Vocal Synthesizer Like "UTAU" or "VOICEROID". It would be a way to make your own text to speech using your own voice. But how would I even do something like that on Python? I am a complete beginner and I would obviously learn the code first. I would just want some advice how I would start this project. If you need me to explain more about it I would be more than happy to ! Thanks in advance!!