yeah the coil hose can be a pain...but for a one time use,it'll do.
You want a 2k high build primer...go to a autobody supply store...for what you are doing...get a qt of high build 2k urethane primer and hardner.....if you are down to bare metal...use an etching primer first.
The high build you will want a few good coats..using the spray gun for the primer will give you a feel for how it sprays..and if you get runs in the primer...you'll be sanding it out anyhow....and then let it dry for a day or so.
Then wet sand it with 400 grit....until its nice and smooth...not orange peeled.
use an ammonia free glass cleaner...wipe everything down before you spray the top coat.
If you want the flat black look...go with a single stage paint mixed at the autobody supply...a qt should do you fine...and get the recommended reducer and hardner...they'll show ya how to mix it...pretty straight forward.
Mix only as much as you plan to use...once its mixed it will harden and cant be stored
so :
2k urethane high build primer
etching primer..for bare metal
1 qt flat black single stage
reducer
hardner
tack cloth
paint strainers
paint stick
water filter for the air hose
respirator
lacquer thinner...to clean out the gun after
do a test pattern with the spray gun...should get an oblong football shape....if its an HVLP gun you want about 25-30 psi at the gun...so a regulator at the gun/hose connection is a good idea.
That compressor is small for the task at hand...so its gonna run non stop when you spray...you are doing small pieces so that should be ok...but dont bleed the tank volume down with excessive spraying....let it stay relatively full...as in ..spray the tank..let it build back up...spray the panels...let it build..etc,..
my tank is 6.5 hp and 60 gallons...and its a little on the small side for larger projects...works ok for bikes etc,..
I use a roll of 3 mil plastic from home depot to make a spray booth in the garage..tarp of the walls with it...about 8'x8' and then hose the floor down to reduce dust...give plenty of room to move around the table...make sure you keep as much dust out as possible...mask the table if you have to etc,..
practice on a piece of scrap metal or paneling etc,.. to get the rhythm of the gun down.
make sure you clean the gun out with lacquer thinner as soon as you finish priming...several times until it comes out clear thru the nozzle....that way it doesnt screw up the color coat.
NOW...after having said all that.....IF flat black is what you want....rattle cans will work way easier...the only thing I dont like about rattle cans is...they are typically only 1k products and dont hold up well to gas and abuse...and flat paint jobs fade quicker..and are harder to keep clean... as in hand prints and oil smudges, chalking etc,...
if you are going the spray gun route...pick a cool color and go with it...if you want to get crazy ...go base coat clear coat...and it will be sweet and shiny