If I have RMs, Builders, an empty space (deep space) and a dc usage...


Is that everything I need to successfully build a station, counting on the fact that I can get everything to the location.

and do I need to join the Faction of the DC i'm using?

There are no such things as DC for station as far as I know. So you need to join the faction and have permission to build. If you are in an owned system, you need permission from the owner. No problem in Deep Space, except you pay double construction cost.