I have been in business for 4 months from home.
I have lots of work, word of mouth works great, but 3 main things work well I found.
1, Leave business cards on the counter of friends or aquaintances shops or businesses, chicken shop down the road, etc. Give 5 to mates to keep in their wallets and hand out for you. Reward them with movie vouchers, go-kart rides at the local track, or whatever you feel appropriate when they refer jobs which pay well enough to afford to reward them too. You'll be surprised how much work you get when they get a "kicker" out of it too!
2, Make sure your name and phone number is on every sign you make for 2 reasons, a) it shows you take pride in your work and don't mind "owning" it, and of course b) because it means anyone wanting something similar can call you. Sometimes I ask if I have a good relationship with a customer to put a larger advertisement on the sign or vehicle, normally they're only too happy to let you do so, especially if you make them some extra bumper stickers free of charge or some such thing, a discount or something.
3, Make bumper stickers, small labels, and a couple of small banners you can keep in the car or your wallet or pocket, next time you're at a footy game with the family throw a banner on the fence for a couple of hours. Join a club and "sponsor" them by supplying bumper stickers for members free in exchange for having a banner on the fence. Put your labels and stickers on anything that you can. How many times have you thought, if only I had a sticker, I could put it there!
Best of luck... but really, you have to make your own!
Gadget