FreeBSD newbye simple question

Experienced linux debian user, recently I smoothly moved to linux gentoo
(BSD compliant) AND to FreeBSD 5.2.1.

1) I want to tailor my freeBSD slice according to my machine (gentoo
experience is helpful!). Now, while i I know how to compile an
application in /usr/ports I cannot find sources of the "base system" I
had to install when starting the first installation from scratch.

Where are those sources?

2) The questions' question: where can I read what are the options I can
use with a certain source package and how can I use them when
make(-ing) the program?

3) It goes without saying that many freebsd commands are the same as in
linux but I cannot find the freebsd command equivalent to the linux
command 'free' giving info about the size of memory used by the
system's cache, buffers, swap, etc.

Please help.

Vittorio

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