D.T.
I have done 7 garage sales (my subdivision put them on) and I found the easiest thing to do was make tables with certain price points...$.25, $.50, $1.00, $5.00, etc. with signs noting the price. VCR tapes go for .25, if clothing is in great shape, $.50 a piece, other wise $.25, womens clothing, it depends on the brand and shape of the item, anywhere from $.50 - $50.00 Toys, again, depend on how worn out they are. If on the first day they do not sell, then lower your price the second day...if your desperate.
Good Luck To You!!