if you are asking about igniton timing (or distributor timing) then you need to use a timing light. you can follow this procedure http://www.c-speedracing.com/howto/timing/timing.php
if you are having trouble finding the marks, get under the car and look closely at the pulley, the color may be invisble due to dirt. you can re-mark them if needed.
your timing belt relates to cam timing. you can check that be turning the crank to the 0btc (see pic in link above), line it up with the line on the lower timing cover. remove the valve cover then make sure your cam gear is pointing up and the 90* and 270* marks are in line with the top of the timing cover