Personnaly..took me like 12hours straight just to master the basic primitive tool.
It'll take a crap load of time to get it right (I have about 100 hours on it and still my vessels are average). If I can offer you a hint though, go on internet, google images, type spaceship (or satellite! Or any other vessel you might want)) and just try to recopy it!
You'll probably fail at first (thinking your model is crap). Save it, close program. Following time, either reopen the vessel and try 'cleaning it up' or simply start the design all over again! You'll be amazed how quickly you're basic skills will go up!
Any other questions or further info, just PM me! I'm always willing to help!
Justin S.