What kind of chipping are we talking about? Do you have an pictures of the chipping paint?
You probably didnt clean the metal with degreaser after you sanded it. You also didn't prime, and you also didn't sand between coats. Additionally, you didn't use paints designed to paint metal.
Nobody is calling you a noob, even if they did, why would you care? You are the one asking for tips on the internet, why should you get upset when somebody questions your shoddy paint job?
All things considered, get some real paints, sand a lot, use primer, use lots of clearcoat and hope for the best.