ok guys,
i solved both printers!

how?
got on http://www.freebsddiary.org/apsfilter.php
after reading it, i deceided to begin a new setup on another pc with freebsd 5.2
there, in the /stand/sysinstall there are new entries which included printer utilities such as the apsfilter and cups, installed them both,
then it was simply run the SETUP from /usr/local/share/apsfilter
and there it was nice and easy, although for my brother 1660e, wasn't supported, installed the brother 1270 with the hl1250 driver, printed test page: ok!
for the serial zebra label printer, i installed generic ps driver an configured the serial port communiction with the data bits and bps...
didn't print a test page but, i found out zebra only respond to files beginning with ^Z or ^X, printed a txt file we use on as400
lpr -PRAW file.txt
printed ok! (RAW is name of que of that printer.

but now i have the following question for you guys:
what do i have to configure if i want to let the as400 print stuff on my local printers. according to our outsourcing firm the lpd deamon needs to be running and the queues of the printer must have the name that will be declared on the as400 like
name on as400: PRT01 and PRT02
then on the bsd it should be /var/spool/lpd/PRT01 and ..../PRT02
we tried to print from windows via lpr but didn't work, tried from as400, didn't work
personaly i think we need to install samba on the bsd?
or is it something else we need to take a look at?

thxn for your replies guys!