If all the wheels are in that sort of condition, the refurbish is very simple, sand wheels with 180 grade discs on a sander, 180 wet/dry if no sander is available, tyre beads can be broken by a tyre fitter, this allows you to paint down to the inner wheel, without removing the tyre.
3 coats of aerosol etch primer, 4-5 coats of 1k primer, rub down with 800 wet/dry, trying to avoid rubbing through to the etch primer...
then apply the silver, dont count the coats! just keep going until all of the primer is covered, and your happy with how it looks, but take your time to avoid runs
Once touch dry, after half an hour or so, apply the lacquer, again dont count the coats, just keep going till your happy with how it looks..
best done in the warm if you can, heating the wheel with a hot air gun will help immensely with all of the drying processes
2 large etch primer
2 large 1k primer
2 large paint (basecoat)
2 large lacquer
this should be more than enough for really good results
Use "Mercedes Brilliant silver" code 744, for your silver, this is a good clean silver that has no pearl tinter added to it, that may make the wheels look strange, and is ideal a a wheel silver...
Thom