Everything should be set up, and you should be ready to put your new, more secure BIND into action. Assuming you set up a SysV-style init script, you can simply launch it as:
# /etc/rc.d/init.d/named start
If you take a look at your logs, you should find the initialisation messages
that BIND spits out when it loads. (If not, there's a problem with your
logging configuration that you need to fix.)
Amongst those messages, BIND should tell you that it chrooted successfully, and that it is
running as the user and group named. If not, you have a problem.
You can go take a nap now ;-).