We made snazzy road signs that we nailed to telephone poles en route to our sale...
We made them in the shape of tags....for the string part that would be on a tag we strung through lots of colorful ribbons...It seemed to pull lots of people down to our sale...We got lots of positive feedback from "customers"
The only trick is not to put the signs up till the morning of your sale or your gonna have strange people (early birds) waiting around your house (personal experience) and take the signs down right after your sale is over for the same reason...
we separated all of our items into sections...housewares, jewelry, clothes, toys etc
the best thing to do is really spread all of your items out so they are visible....put down a tarp on the lawn and fold out the clothes, baskets...etc, the things we did that with seemed to sell more
Make sure that you advertise that you are fundraising....people usually spend more if they know where the $$ is going.
Good Luck with your sale....they are always so much fun! ~M