1. Check for runout on a wheel balancer . If the wheel's bent it may not be able to be balanced properly and you will have wasted a lot of time and money on a wheel that's no good.
2. Sand blast it. A lot of the imperfections will be removed and it will show you exactly what you are working with. Then check the outer rim surface for gouges and curb rash and repair / refinish.
3. Treat the surface the same way you would a body panel. Most blemishes can be fixed with a slight skim of filler or autobody putty.
4. Use a high solids primer or an epoxy primer . Several coats and block out the same way you would a panel. Do the front and back of the wheel.
5. Multi coats of Argent silver.
6. If using a clear coat, get a high temperature rated product or the wheel heat from braking will yellow it out.