how far they are from #1

well the only answer i got for this one is that yes they shounld be close to each other as possible so you can get your fleets there in case of attack

1.you hit galaxy,hover your cursor over a planet and hit attack,then go through what comes up

2.metal,crystals, and deuterium

3.ships, light fighter small cargo large cargos, hevay fighters,etc....