Info on guns. it seems the HVLP guns are really popular for a lot of guys.
HVLP is the practical way to go, have a difference between siphon feed and gravity feed. A siphon feed uses a paint cup on the bottom while a gravity will have a cup on the top. The hot thing with gravity guns is they make plastic paint cups with plastic liners, which means you don't have to worry about trying to get every speck of old paint out of a metal cup, which most older or cheaper guns have.
You need to make sure you have clean air going into the gun, and have an air compressor that can meet the demands too. Each gun has a different PSI they cover the best at, generally range between 20-40psi. A gauge mounted to the bottom of the gun is helpful to find a more true reading, though some guns have gauges built into them.
There are a bunch of different brands, so picking one depends on your budget.
Info on paints. I know for the most part this preference, but maybe pictures of finished work.
All paint has a "P-Sheet", you may need to ask for it though while at a paint store. It will give details about how long to wait between coats, how you should reduce the paint, tips for applying the product, and other important information.
Before you lay a topcoat, you should figure out if you need a primer, like an etching primer for bare metal spots, epoxy primer to go over body filler. Or maybe you just need a sealer, it all varies depending on your project. The big thing to realize is that epoxy primers and sealers come in different shades (variances) and they will play a big role in how your topcoat comes out.
Topcoat paint can be single stage, two stage or tri-stage. Single stage is popular with at home painters because it's almost like clear coat and base coat mixed together. It means that you'll have glossy paint after one coat if you stop there, or two coats, or three coats. It combines some UV protection with color. A more expensive job would be two stage. This would be base coats being applied to cover over primer/sealer or existing color. The number of base coats you need to apply varies by project. After you're sure the base looks good, you start applying clear. The applications of clear you put on too varies by project.
Lots of different paint companies out there, depends on what you want to pay and what you're expectations are. You can get urethane based or water based basecoat, though someone at home would want to stick with urethane based.
Wet Sanding/Buffing info. Seems 3M and Meguiar's are pretty popular. Also, the different ways; some do 1000>1500>2000 then polish; some 1500>3000 then polish...
Depends on how bad a section is. If you have dirt that you want to "de-nib" you might wet sand it with 1500 or 2000. After you de-nib, wet sand with some 3000 trizact on a DA, keep wetting the area with water.
Buffing, a variable speed buffer is nice if it's in your budget. Foam pads, a white or yellow one for #1 compound, black for #2 and finish off with a blue for #3. Foam pads with holes in them help cooling which is good for first time buffers. I'm referring to the number system 3M uses, that's the only stuff we ever used at shops. Make sure to clean the pads, before using with the buffer on and use a stiff nylon bristle brush. Gets any dried compound/dirt off them. Make sure you're absolutely done with #1 compound before moving on to the next steps, use a detail cloth to clean off an area for inspection if you're not sure.
Just in general any tips you have for anyone looking into this or even getting ready to start their project.
Practice on little things first. Be prepared to spend money if you want it to look good. Paint will show up all imperfections, so make sure everything is 100% how you want it before laying down color. Wear a respirator when shooting any type of paint, primer or sealer! Make sure that you prep the area before paint properly, sand it, scuff it with scotchbrite, wipe it all down with DX330 or a similar wax and grease remover. Blow it all down with an airgun, because a paint gun will make all the dirt come of cracks when you don't need it. Use a tack rag to wipe down everything right before painting. Good lighting makes a huge difference. Make sure the area where you're going to paint is super clean beforehand. Clean any gun thoroughly after you use it, if you ever want it to work right again. Mask off or cover everything you don't want painted, over-spray is not cool.
Hard to cover everything/every scenario, hope this gives you a good start!