I have never used china berry so take my remarks with a grain of salt.
I would remove the bark asap. Nothing is to be gained by leaving it on.
Sometimes the backs of whitewoods check for me and sometimes they do not.
If you think it might check then sand with 100 grain and 220 grain, stain, and seal with a poly.
For a length leave a good 6" then later on you can shorten it. Maybe double your draw and add 20% if the crown is not too rounded. If it is then add a good 2" to that.
In a heavily crowned stave the tension forces along the back are concentrated down the middle or high point.
There is much more on my site.
http://traditionalarchery101.com/Jawge