Hey Vader what scale are you working with? I've got some general advice along the same lines as you've received above.
For 1/48 and larger I have good luck with spray paint. Good ole Testors has great gloss and matt clears. Used them on multiple models including some show winners. On a related note I just learned that Rustoleum owns Testors now. May have been that way for awhile and i just picked up on it. Anyway what takes me on a tangent is that I picked up the full size Can of their matte spray paint and it reads exactly like the more expensive per ounce bottle of Testors. Go figure. Used it on my B-2 with good success.
For the small stuff I've found the spray can put out too much. It ends up pooling on the model if not super careful. ive gone to an air brush for everything now. I started with the ones using the can of gas but quickly grew frustrated with it. For 1/72 it would probably be ok but i was building alot of 1/48 and 1/32 stuff and it was too small and took too much gas to finish.
ive never brushed any clear on so hopefully others will chime in for you there.
the other question for you is what type of paint are you using - enamel, acrylic, lacquer? If acrylic then you have to be super cautious with the tamiya or Testors clear coat. Too much at once and it will melt the paint...ask me how i know. lol my 1/32 F-4 Phantom has a different shade of white paint on each wing.
Hope all our advice helps. Toss back additional questions as you have them. I was new to the whole painting element just 4 or 5 years ago myself so I enjoy giving back.
chris
edit- yes to Michaels. Also Hobby Lobby and your local hobby shop. My HL has air brush selections but Michael's doesn't btw.
In the pattern: Scale Shipyard's 1/48 Balao Class Sub! leaning out the list...NOT! Ha, added to it again - Viper MkVii, 1/32 THUD & F-15J plus a weekend madness build!