some questions about Voynich language and charactor

[februs]

In the current, Voynich language is understood like Arabic language or surrounding language?

and about characters..

I think..

    ＝ a       
    ＝ ch
    ＝ yy
    ＝ z

are these right?

I have a wish.
I want to know correspondence alphabet and all characters of VM.
do you know a site written about them?