I have purchased the YoyoJam Classic and Magic Yoyo N12 for my project. The yoyos are very budget friendly, fitting for the Trick Ladder, and was very recommended by people on yoyo forums when a researched more about them. Plus, the N12 comes with a yoyo glove and five extra strings. The extra string will help if the yoyo's string frays and breaks, and the yoyo glove helps to relieve friction on the hand that you do tricks with.
   Also, I have started to look over videos of the Trick Ladder and get ready to get started.