the dents must be primed over and properly sanded or it will shrink back and you will see the repair under the paint work
but apart from that if everything else has been sanded, throughly blow all the dust and grime out with a air hose, then you can go two ways about this.
1) wash the car with a hose making sure you get the water pressure into every nook and cranny then dry and use air nossle again to remove whats left over
2) or if you have enough use prepsol and the correct rags and wipe down the whoel car and everywhere else you are gonna use masking tape other wise it wont stick...
mask up car depending on how much youve taken off your car, there are certain types of tape for different things...
such as
the seal mould at the tops of doors; there is a tape with plastic edging that slides underneath the mould then pulls upwards when you stick it down**make sure you blow out under here if you use this***
ot you can get fineline tape which is plastic and very flexible which can go on the egde of your mould make sure you dont get the tape touching both surfaces or when you go to take it off you could risk pulling the paint of the panel NOT COOL!
mask the rest of the car as nessecary then a once over again with prepsol...
you should be ready to paint now
depending on where you are painting i.e. shed or garrage....spray all the walls and floor with water first (before cars in there) to prevent dust and shit in the air as much as possible if not do it right and put it in a booth you can hire them off most workshops on a weekend...
hit the car over with a tack rack to remove any last particles laying on the surface and your ready to put your bases down...
anything else you need just ask:)