Good luck.
We had one last year and my goal, which I met, was to buy
4 - 10 day, non expiring, hopper with plus passes
(But, this also included big ticket items I sold on craigslist)
If I didn't sell it, it was getting thrown away (my husband didn't want it back in the attic) so, like you, I priced to sell it and get rid of it.
I found that if I saw someone just looking at something that say I priced at $5, I would immediately say, do you want it, you can have it for $3 (whatever the price, I just dropped it). A lot of people would say ok instead of looking at the item and putting it down.
I also had lots of clothes. I started out fill a bag (the plastic bags you get at foodshopping) for $5. After an hour or two it was fill a bag for $3 and as it got closer to the end, $1. I did NOT want it so $1 was better than having it sit there.
Nicer clothes should be hung. I kept coats together, dress clothes together, etc.
I made sure I had an extension cord plugged in outside so people could make sure the electronics worked.
I saved McDs toys for a year (my kids are 9 and 13 and eat the kids meals and don't use the toys) and sold them .25 each 5 for $1. They sold very fast.
Shoes, especially childen's soccer and baseball cleats sold fast.
Like I mentioned above, I also used craigslist. I was in the middle of a big remodel and sold my family room furniture, two tvs, a dining room table, 6 chairs and china cabinet. Kitchen table, 4 chairs, microwave, Thomas Table (kept the trains and tracks) and fish tank.
I could have sold these at the garage sale but made much, much more money on craigslist. I found that site thanks to my dis friends last year.
Good luck and have fun at your sale. Let us know how you made out.