Hi i have question
this is good basic grafic tablet for start with zbrush?!
http://www.wacom.com/en/in/creative/one-wacom-s
please answer asap 
i have limited time to answer
Wacoms are generally fine for digital artwork. This particular model appears to be a newer version of their budget Bamboo range.
You might want to check out some reviews from Youtube etc…
I’v had three different models (Intuos range).
They’ve all been pretty good but expensive.
If you’re looking for a cheaper alternative have a look at Huion’s tablets.
I should imagine the Wacom One will be fine for sculpting.