Starting my 55 series 2 short bed step side

[kuda with the 55]

Hello everyone. My name is Kai and i'm 18 years old. I recently just closed a deal to pickup my 1955 Chevy 3100 series 2 step side in the summer. Its in relatively good condition with not a lot of problem rust and already some mods done to it. I have some ideas as to what i want to do but seeing how im only 18 i am not very experienced and have little knowledge about this truck (only that i love em). My first thing that i want to do for sure is upgrade the frame and suspension and brakes etc.. basically everything on the underside. I just want to get some advice and ideas on what i should start with and focus on and make sure is sound before i move on to other things. I eventually plan on air bagging her but thats a long ways down the road. i just want to lower her a little but now i keep rambling. again just any advice and ideas would be greatly appreciated.