Ok you've made yourself a pile of wood. You'll need.
a pound of 1 5/8 deck screws, a few 1 1/4 deck screws, and a few 2 inch deck screws. A counter sink and bit for the deck screws, saw, screw bit for drill and square. A cordless drill would be nice. You can justify a whole set of tools when you figure out how much 4 wobbly chairs would cost.