[member="Xero"]
Not an FJ but I do have a player-made company so maybe I can help you out a little.
-To get to 50 posts, do a RP related to your business. Most likely you'll start at Tier II, which typically means two planetary locations that are close in nature and maybe, maybe a space station location. Do a thread where you acquire another location or build a shipyard or buy a podracing stadium, etc etc. It will help in the long run.
-Think about what your business is and get to work on a sub in word processor/office now. You mentioned underworld activities. Is your business a front for this or legit? Where are you going to set up? What are you going to make? If you're going to make something common, like weapons or starships, what sets yours apart from the rest of the approved subs?
-Check out the South Systems Bizarre. Its owners of companies posting their services. Eventually(to move up in Tier) you'll need a contract with another player owned company or faction. Its never too early to start making friends in high places to get this done.
-Have fun!