tbh, I'm crap at typing so nothing I said probably made any sense.
Well, You want to make your own UTAU voicebank and I understand that.
You really can't jump blindly into making a voicebank, ^_^;; you will need to learn a little bit about how it works before you will get a good result.
luckily this forum is full of people who are more than willing to help you and there are plenty of resources!
If you want, I can show you some things- The first thing you may want to learn is how to make a basic oto (and maybe a few other necessities)