Getting started to work on my 1974 Dart Sport. I got questions

If that's a factory 74 Dart Sport 360, keep it close to original as you can, they are pretty rare cars & yours looks like it's in pretty good shape. If it was raced at one time, they didn't mess with it too much from what I can see by the engine bay pics. What barbee6043 said would be the way to go. First off, drop the fuel tank, clean it, flush out the fuel lines & clean the carb. Change the oil & filter, change trans fluid & filter (Keep it automatic if that's what it was from the factory) tune it up, plugs cap, rotor, ignition wires & air filter, then check the transmission linkage, it sounds like it's not adjusted correctly. Check the belts & hoses for any needed attention, check all the other fluid levels. First & most importantly, get a FACTORY service manual, you should have no problem finding one the get to work. It will be well worth the time & money spent working on it & you'll learn a lot, that's always a plus. Good luck!