I developed code for an [Arduino](http://arduino.cc/) board (Arduino Uno + Ethernet Shield and some sensor) and I am thinking to try to make some money by selling the resulting system. Is it legally possible make that with Arduino? If so, what are next steps in order, for example, to assemble the system to a "compact box", "economize" things and start production?

In other words, what "I have" / "I should" make now that I have implemented a working prototype of my system?

Note: I am newbie in business related to electical matters.