I'm sorry you feel overwhelmed and not helped here. I really am. No sarcasm. In some of my other posts I talked about some of my early problems getting used to this system.
I have found that distance is arbitrary and range band size change on circumstances. When fighting in enclosed spaces, like a large wharehouse, Starport, or ship, I make my range bands "smaller" in that short range is a shorter distance, and so is medium, and hence long range. If I have a fight in a more open area, like a football field, then people can shoot "further".
I have found that I don't have to tell my players that a baddie 20 meters away or 30 meters away. That is medium range. All I have to say well, the baddie is around 25 meters away, so that medium range. I don't get bogged down into if it's 20 or 30. There is no point in this system. Any more, now that we have been playing together for awhile, I don't even use numbers, I can just say medium range.
But does it really matter if that house across the street is 100 feet, 30.48 meters, or medium range away? It all the same the same thing. Just medium range can be a range from "here to here". I use a white board and can draw medium range on it then show the house in the middle of it. It doesn't change the fact that it is still in medium range. Just like in WEG where medium range for a gun could be 30-75 meters. It really didn't matter if it was 30 or 75, it was Medium range for that gun.
I have to say, in all honesty, I really don't use the range bands that much. Most of my combat happens in close/ medium range, and we don't do ship combat right now. We do do some vehicle stuff, but not much.
If you have any other questions or concerns feel free to PM if you want. It's a bummer to want to enjoy something and not. I have found this to be the best Star Wars RPG so far, but not everyone agrees. I have had some players who can't stand it, and others who adore it. I had one player who really wanted a lot more out of Astrogation than what this system provides, especially before the smuggler book came out. He wanted to sit down with a star chart and really plot out in depth detailed routes... And he was the only one who wanted to. So this game is not for everyone, nor is Pathfinder or Shadowrun or D&D 5.0.