logrotate woes

Hi, I've been pulling my hair out trying to get my /var/log/messages to rotate. Extended research with logrotate has not given me the info I need. I've read the files that need to go into logrotate.d, but I don't know where to get them or what the content is. I've tried restarting syslod.d. I've tried putting a script in the crontabs, I've tried tweaking the logroate.conf, but nothing works. Can someone help me? Many thanks in advance. Paula IT Analyst III TSRI La Jolla, CA 92037