I painted my sons Challenger in our garage by framing a paint booth out of 2 x 4 and stapled heavy plastic to it and had plastic on the floor.

I built a box at one end of the booth that faced into the booth and put furnace filters in it. on the outside of the box I cut a hole large enough to put my leaf blower through and tied it so it would blow into the box. The air would go through the filters and be clean. That would presurize the booth. At the other end I had a row of furnace filters that the paint dust and fumes would pass through. This kept the both clear so you could see. I got some 4ft shop lights and a few halogen lights which were installed on the outside of the booth shining into it. This setup worked really well. The lights on the outside were for safety of not having the place blow up.
I used a couple of moisture filters on my air hoses cause water will form in the hose as the air cools. a couple filters in the line are cheap insurance.
Hope this helps.