I made some search here, and i found many post regarding IPtables. however they were inadequade to my problem.

I am really new to iptable so I have no Idea how to use it. I want to block the ports that I am not using.
I have
25 SMTP, I want to use it only to send no to receive, is that possible?
53 I guess this one I can do anything can I?
not 80.
what hell is 515 printer listening to and 578 submission . I also have the higher BIND port 953 open
I wonder. I have mysql l3306 open. but only my pc use it., when I tried to start mysql with the --skip-network apache wouldn't work. so could I just block all the traffic from outside?and I also tried to start my Xserver with --no-listen somethink like that, to avoid any listening.

man I have a lot of open ports.

By the way I am using
Slackware, apache,mysql,bind,smtp to support my webserver
Thanks Prophet