I've been out rescuing innocents in the Pleiades in my shiny new Orca, now with added scorch marks. The burning stations are very intimidating places, you want to get out quick, as do all my passengers judging by the incoming messages. I don't appear to be building any rank with the Alliance though, I have a reputation bar but not a rank one. What am i missing?
You gather rep by doing missions etc. Once your rep goes up to a certain point, you increase your rank to the next level. If you want to increase your imperial rank, you must do those missions for a fraction that is aligned with the empire. Grinding rank takes time, which is why most CMDRs "cheat" and figure out, which method is the fastest.
For imp rank grind, the method used to be flying data missions between Ngalinn and Mainani. Both systems need to be in a "boom state", but they were that, the last time I checked.
For fed rank grind I used another method. I went to "fed infested" stations that were being repaired, after being attacked by thargoids. You can find those in the Galaxy Map. There you look at the mission board. To rebuild the station, they need certain thingies (can't remember which, but 3-4 different "commodities"). Write those down, and find a nearby station selling those (using
EDDB). Then go back to the station being repaired, and take the missions where they ask for the thingies. That way, using a ship with a lot of cargo space, you can just sit at the station waiting for the missions to arrive, hand in the goods, and get rep>rank, without having to go and get thingies for each and every mission. The mission board dries out over time, so to be really efficient, you find the closest other station being repaired (has to be imp in your case), and then you go and grind at that station for a while. When that runs dry, you go back to the first. Rinse and repeat, and you'll gain your rank in a few hours or days, depending on your stubbornness.
Happy grinding!