Welcome to the site. We are having a little get together this weekend at 2pm in Grandville (grand Rapids) at Buffalo Wild wings (just down the road from Cabelas). You are welcome to attend! We also have a summer crappie fishing outing coming it at Croton Hardy on the weekend of June 6th. We would love to have you there. For more information you can checkout the threads on it inside the Michigan forum.
As for your questions: Your slip float rig should work just fine. I personally prefer a longer rod as it get more leverage during the hookset. As for a hook: my personal favorite is a gold aberdeen hook in number 6 (long shank). You are correct on the cold water however crappies will start hitting the shallows as ice goes out. Also, the history tells us that the hands down best crappie fishing (besides the spawn) can happen during first ice and last ice of the year. Sunlight has a ton to do with it. Crappie love staging outside of rivers, cuts and canals as they get ready to spawn. The do not like a ton of current but will hang out outside of rivers that are pushing run-off out into the main basin of the lake. They are gobbling up about anything that comes out of it.
Minnows might be your best bet but I wouldn't overlook waxworms or other live bait for ice fishing although you might have to fend off other bait stealers. As for casting. You might try 1/16 or even 1/32 oz depending on the depth of water and how far you want to get down. Couple that with a variety of soft plastics that all work at certain times. My personal favorite is a "Big Bite" 2 inch shad in gray and black. I also like the big bite twisters in several colors. Tubes are also good this time of year.
If the water is stained because of run off, you can get away with about any type of line you want. If it is extremely clear, you may want to run 4lb test line. I use Stren but there are tons of different companies out there that work well (Vicious is another favorite of mine).
Ford lake is a great crappie area. If you have no luck, might I suggest Bellville lake right around the two bridges that go into down (I think Bellville road). Pulled a ton of crappies from around the bridge pillons using slip bobbers, hooks, tiny sinkers, and minnows.
Welcome aboard. We look forward to hearing from you!
I have OCD "Obsessive Crappie Disorder"