If I'm fishing new water and using the slip bobber with a minnow rig, the first thing I do is find out how deep the water is. Just keep adjusting your bobber slip up until your bobber lays over. After that, I rig it where the minnow is just off of bottom. I then cast out, let the bobber get upright and start slowly reeling it back a little bit and stop. I might then reel it a little faster and then stop to let the minnow drop. This lets you cover a lot of water fast so you can find some brush or where ever the crappie might be holding. You can also do this with a tube jig. It works just as good and sometimes better because the jig tail has more action than an a ole minner. Hope this helps!
The only way to have a good fishing spot is to make it yourself!