Start with a rust and blue remover. That way you can see what you've got to work with before you start sanding. That way you can determine if just some steel wool will do the job or if you need to go heavier.
For a home done finish, I like Brownell's AlumaHyde II. Some folks like Duracoat. Both come in different colors.
“If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen.” ― Samuel Adams