I agree with 2 other replies, get some epoxy layed down over the bare metal, and wait until nicer weather to paint.
I primer & paint in my shop all the time. I have put together a temporary booth that I can set up and tear down easily. Get some 1.5" or 2" PVC tubing from local hardware store. The larger diameter is sturdier, but depends on how much you wanna spend. I bought fittings (tees, elbows) on-line for cheap. Make a big cube out of the PVC and put a clear tarp over the top and sides. Use a clear tarp so light gets through. I use at least 1 middle post along each side for support. Mine can be built anywhere from 8 ft tall x 6 ft long for spraying parts and small pieces, to 8x20 for full car to fit in. Just depends on how many sections you put in.
Then use fans, 2 tall and 1 short to circulate air out of your garage door while you paint. The air should blow under and over the area you are painting. Not directly onto the vehicle. You need to lay fresh plastic sheets down just before you paint, or wet down the floor to keep dust down, but sheets are best. The tall fans are the most important, they will blow away any particles that come into your space. Leave the fans running while the paint dries for a couple couple of hours. Should keep any particles from landing on your baby.
You will find what works best when you shoot the epoxy primer. And, you can afford to make mistakes with primer. It just gets sanded and covered anyways. At a minimum, I would shoot epoxy, do any final body work/filler, spot spray epoxy on those areas, shoot 2K sealer, then paint. Always sanding between layers, going from 220 (epoxy to sealer) to 600 (sealer to paint). Then the wet sanding begins! But you may not be looking for that level of detail. Single stage paint may be fine for your needs.
You'll get many opinions on this. What I'm telling you is just what works best for me.
Good luck and take pics
