As far as the motors go, MonsterGuts does have awesome ones that are pre-wired and so simple even I can do it... but I know you can get decent ones from places like this:
www.sciplus.com
If you know how to wire up the wall warts to power them, it's easy. You're mainly looking for a motor that has a bit of torque so it has enough strength to move the ghost without stalling out.
You do not want a heavy ghost unless you have a motor that can handle it. I've got one made from cheesecloth, blucky bones for the arms (added bonus that the bones were treated with glow-in-the-dark paint and the arm bones show through the cheesecloth). I've got a coat hanger for the neck/shoulder area, connected the bones with fishing line so they have enough play to move easily and carboard hands painted white. The face used to be just straight cheesecloth (an experiment using fabric stiffener while on a wig head, then peeled off so the facial features were molded into the cheesecloth), but I've since added a very light foam skull to hold the head shape and add an element of scary to the whole thing.
I bought my FCG rig complete with motor from a forum member, and never regretted it - it's not a wiper motor, but it's a small, powerful little thing with a small fan attached to keep the air circulating and it's been running quiet and well for the last 3-4 years. So I can't help as far as what type of motor it is, but there are many different ones out there that could work and probably be had for under $20 if you know basic wiring.
As far as glow? Anything that has phosphors in it will glow brightly. That means in general any clothing detergent that claims to get your whites whiter, since that's what causes the white... tide, arm&hammer, surf... they all work. Even things like fabric softener and hand-washing liquid for clothes like Woolight work. I bought a dollar store knock off of Woolight (already had it for washing delicates anyway) that I put into a fine mist spray bottle (half water/half detergent) and turn on the black light and spray down my ghost each year, and she GLOWS quite brightly. All of those are going to get you a blue/white glow. Added bonus to this method: you get a lovely "freshly washed clothes smell' and you don't end up with paint everywhere, so it's safe to do inside since the overspray isn't going to hurt anything.
Rit whitener works very well too, but I never saw the point personally in getting something specific when I already have on hand something that works really well.
If you want another color, you'll have to look into things like glow-in-the-dark or florescent paints. You'd need to dilute them with water and either soak or spray your ghost, but as you're using paint, do it outside where you can make a mess and it's easy to clean up.
Not sure about these, but they would probably work:
http://www.amazon.com/Next-Generation-SUPER-Glow-Paint/dp/B0029NDIUU
If you are using blucky skulls and bones that don't have a glow paint already on there, you can always get some from the craft sections, or do a single layer of cheesecloth over the bone/skull and that will glow with whatever medium you end up using.
