a great reputable sydney agency for a film AND theatre actress with no showreel and no professional experience

Dear Jujuhead I notice you have been a member of this site for a couple of years....although you may not have logged in for a while?? Check the FAQ section. There is a lot of stuff about finding Agents in there. Read it, all of it, even the bits you think don't apply to you. I'm assuming you're thinking of moving to Sydney or are already there?? Are you taking classes? If not, why not? If you want to work as a professional you will need to keep your skills sharp and learn new ones. You never stop learning. In some classes or schools there may be sessions on how to approach the local agents. At the very least an agent needs to know what you can do. The best way to give them a taste is for them to see you in something. Go through the yellow pages, ask other actors (yes, I know that's what you are doing in this post), put together your acting CV with a headshot. Send it out, with a reply paid envelope, expect a lot to come back with the "thanks but no thanks". Do not disparage ad work, it pays the bills and gets your face onscreen and out there. It can become part of your showreel. You might think that an ad for coffee won't land you a part in a Shakespeare but I personally know of one case where it did, admittedly this was in the UK, but the director was after a specific look for a particular part and saw it in the ad. Read the FAQ, there is loads more to unearth in there. "Life is too short to stuff a mushroom"