Start with a long triangle. Curve the lines slightly to make the rocket look round.
Add two fang shapes to either side of the body
Make a circle in the middle of the body and then another circle inside that for a window. Add some dots around the edges to give it some rivets!
Draw two sausage shapes to the bottom of the rocket and stick two rectangles underneath. Again, if you slightly curve the lines it makes it look a bit more 3D.
Simply draw a curved line along the top to cap it off
Finally, decorate your rocket how ever you like! You could add some buttons or lasers or whatever to make your rocket rock!