primer

A 2 part system is recommended. Primer + activator. For a novice I recommend talking to your paint supplier and get the type that is compatible with the brand topcoat you are using. There are lots of 'universal' types that work with any brand topcoat but definately do a little research. Sometimes mixing brands isn't a good idea.
I like to use a direct-to-metal type that doesn't need an etching primer. Probably every bodyman you talk to will have slightly different recommendations or advise. Just stick with something that's proven and you will be ok.
Also, definately use a respirator and adequate ventilation with any 2 part system. That stuff can (and will) set up in your lungs.
Dallas