Filtering

I would like to apply some access rules, for the following:

disallow access to the router (http) (telnet) from untrusted networks

3 networks on router:

wan
lan1
lan2

disallow communication between lan1 and lan2.

How can I do this, or please send me in the right direction,

Thanks,

http://www.mikrotik.com/docs/ros/2.9/ip/filter
Documentation quite well describes MikroTik filter matchers and their option.