Suppose NASA, SpaceX or any other aerospace company has managed to build a technology that allows them to fire a rocket to the moon, from "space". Basically, they have created a huge weather balloon that can reach altitudes so great that atmospheric pressure is effectively zero compared to ground-level - "space".
Considering that the shape of the rocket does not matter (it doesn't have to be shaped like a cylinder with a nose cone etc.) because it isn't affected by air drag, what would a rocket launched from "space" look like?
Note: The highest point where the weather balloon (launch site) can reach, still has gravitational force on the rocket. Approximately as much as gravity would affect it at ground level.