For people into this little breakdown great, it's going to be very straightforward and cut to the heart of drawing different stuff. I am not going to justify my opinions and I am not saying that this is the best, or even a good way to learn. I'll show you what I know and you can see if you think it's worth your while.
Simple shapes. Here's a bunch of quick doodles. If you can't look at a piece like that Star Wars room and see that it's a fairly simple thing to draw (or at least copy).....then really pay attention. I sat down and in about 10 minutes just roughed out different RANDOM shapes I saw to show people here what exists in that room. I added a few just to show little variations on things. These are not drawn to be neat or a pretty picture. These are sketches.....you should be sketching a lot too. Sketch everything. It teaches your mind to work like a computer that eats information and can spit it out.....stuff you didn't even know you knew how to draw, you'll be able to draw (trust me)
The floor of the ship is essentially an arrow. There's a gap down the middle that's a rectangle. On each side of the rectangle there another rectangle.(meaning three rectangles side by side) as they reach the front of the cockpit there's an arc of a pointed half circle or ellipse. The elipse is like a moon cresent that is also in perspective.
For right now....just think basic shapes. A rectangle or cube shape (like the chair), and then some of the arcing shapes or half moons. I drew a "U" shape in a cube also. Get used to doing that at every angle it will come in handy (also drawing circles in cubes, and elipses in rectangles). I also added a few other little random things...some pipes and a few other little gear doodles.
I did this fast and loose on purpose to not over beautify this stuff. I want you to be fearless with your practice work. I am showing you really quickly you can get the basics out and do it freehand to give examples of the "big picture."
This isn't really the lesson(yet). This first lesson is SKETCH THINGS OUT. Sketch everything. Try a 10 mintue study of the room and just draw different things you see...maybe try things with that information and do little freestyle doodles too. If you want...post a link to your results for other people to peep.
Freehand as much as possible. I originally threw down 2 guidelines with a ruler and quickly realized that it's not really the time for that. First we are taking in the image (looking into it) and seeing what the understructure or design is. We don't need to worry about straight lines yet or "how" we are going to draw it. One thing at a time.