Install new packages howto?

[senelord]

I want to integrate openh323 in my pfsense so my user can use videoconference! but there is some package I need to install like:
autoconf
bison
expat
gettext
gmake
ldconfig_compat
libiconv
m4
openldap-client
rc_subr
and openh323

Can someone please help me and tell me how can I do?
Thank you very much for your support

[jeroen234]

i will give you the first 3 things to do

1 learn php
2 learn xml
3 learn freebsd 6.1 kernels compiling