Doing it without mods is really,really rewarding. Actually stations are pretty useless for now,well yeah,for refueling. How to actually build one: You put a docking port and RCS on a fuel tank,then dock it to the main module,for example,a capsule with something under it. Here's another video showing how to do rendezvous and docking Clicky If you need any help trying to figure out what a station or modules need,send me a message