Step 1: Draw a body
Start with a long triangle. Curve the lines slightly to make the rocket look round.
Step 2: Draw fins
Add two fang shapes to either side of the body
Step 3: Draw a porthole
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!
Step 4: Draw thrusters
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.
Step 5: Draw the top
Simply draw a curved line along the top to cap it off
Step 6: Draw some decoration
Finally, decorate your rocket how ever you like! You could add some buttons or lasers or whatever to make your rocket rock!