Conan Edogawa is the result of Jimmy shrinking so he seems very mature for his age, he is around 6-7 years old so he should like a little boy, I would like for Conan to be voiced by a woman who can do a young boy’s voice

Conan Has had 2 official English voice actresses, here is an example: https://youtu.be/394CCiJyLrk?t=45

You don't have to imitate the roles this is just an example, but have your voice sound like a young boy