I used to maske as killing selling name brand childrens clothing like Gymboree or OshKosh.
I wash and put everything on hangers and that always seems to make more money. I put all boys clothes like shorts on one table with a price of $1-$2 per pair. All girls shorts on another table placed according to size.
Any toys like games that have small pieces like Sorry or Monopoly I put the pieces in a small ziploc bag so people can see that all the pieces are there.
Old Fisher Price toys that have the smaller little people than what is sold now seem to sell very quickly. I put all the small little people in a small ziploc as well.
Toys like the Tupperware ShapeO I put the whole toy in a large gallon size or larger Ziploc bag-that helps in keeping kids from touching them at the sale.
I run an extension cord out the driveway for anything that runs on electricity to show that it works.
I sold my daughters Playschool Playhouse recently. It was a little faded from the sun so I went to Home Depot and bought that spray paint that adheres to plastic and I totally repainted the playhouse. It came out so nice I almost didn't want to sell it! Needless to say, I sold the playhouse for only $10 less than the guy could have bought new at ToysRUs
OPEN EARLY. That's when all the diehard shoppers will show up. Let your kids sell lemonade or soda and chips or snacks and they will clean up from people that have hungry kids with them! My kids made $600 in hotdog and soda sales alone! (I let them keep the money from that)
Make eye catching signs by using florescant colored tag board. Shape the signs like a little house.
Have your sale on a Thursday, Friday and Sat. You will get all the shoppers that dont want to tie up their Sat mornings. (my BEST days have been all day Thursdays and early Friday mornings)