Firewall for DNS in my network.Howto?

RouterOS General
1

Ok..Now i want use firewall mikrotik for security in my webserver intranet n internet network.Please…First..what i must to do for configure it?
second…how configure my user manager in my mikrotik?
Now i use Mikrotik 2.9.26.Thanks before

2

http://demo.mt.lv
http://wiki.mikrotik.com/wiki/Main_Page
http://www.mikrotik.com/docs/ros/2.9/