I love to yo yo fish, we like to use minnows and hook them thru the lips, we go for crappie but we catch a lot of catfish when we go, on your yo yos get some reflective tape from walmart so when u run them it will reflect a little light and they will really stick out, we set them at diffent depts, but about 6 to 12" below the trigger mech. we put a stick or something so it will not pull the fish/crappie out of the water, you dont have to worry about the catfish,
now I have a gps and I mark all of my yo yos bc they are easy to loose, and also in spring/summer dont put them under trees especially with leaves bc the snakes like to fall out of them and get in your boat (no experince on this but came close once) and you need to keep your yo yos organized, we wrap them up and then use a foam minnow bucket and put the hooks in the foam and they will lay/stack in it (dont let the yo yo lay in the bottom) and this way they will stay tangled free. and dont be surprised what you catch on yo yos I hav even cought several gar, so be prepared and there a lot of fun!