Yes, the key is in the named.conf file...
what you're looking for is probably right at the top of the file. Depending on the version of Bind you're running there will be an "options" area within that you can specify your fowarders as such:
obviously you substiture "18.104.22.168" and "22.214.171.124" with actual DNS servers. You can also have more than two in there if you like.
The named.conf fiile also allows you to specify zone files for your own domain.
For more info you should probably do some reading: http://www.isc.org/index.pl?/sw/bind/