I would say to use Rusto for fills and a nice euro-can for outlines if you live in America. If not i personally use a mix of Molotow Premium/ Burner (Chrome/Black), MTN Speed/94/Hardcore or mostly Montana Black nowadays. I've also enjoyed using Kobra HP and Ironlak, but they're not for sale where i live.
Montana Blacks are nice, but I like to bomb. Rusto comes in a wide variety of colors and with the right extensions you can go skinny to ultra wide for half the price.
If you are new or learning again do cheap . So I'd say dope basic first . Don't get amontana black as a toy .You'll waste the paint
First of all I recommend getting a water based spray paint so that there is no issue with fumes. I think there are at least 2 out there at this time. You might want to practice a few sprays onto paper or something to get used to pressing the nozzle down before you spray on anything. Remember to spray paint outdoors whenever possible so that you have proper ventilation. Also remember to shake your can first until you can hear the little ball inside the can moving around freely. Continue to shake the can as you work now and then so the paint will come out evenly. It's good to keep the cans a bit warm if possible to avoid paint spattering. When you are finished with a color, you can spray it upside down a little bit. This will clean the cap out and stop it from clogging. Also it's good to have lots of extra caps around to replace any clogged caps.
I use Armor Coat Rust Paint, its the best price can of spray paint i could get that takes male caps, is it any good for graffiti?
I just started out. Found a can of Montana Black and a can of Color Shot out in my garage and started practicing can control on a sheet of cardboard.