So to gain additional Beli you can do a few things:
1) The most obvious one is to kill and take the bounty of a pirate
2) Sucessfully Rob annother vessel. (a member of staff will determine this according to the ranks of the crew members)
100 beli for the top rank and -10 Beli for every rank there after
3) Your Beli increases by 1 per post (this may become 5-10 per post and toppic as soon as we have a substantial amount of members)
4) This one is the real money maker
Drawing in members by inviting them, advertising, etc.
This will gain you 100 Beli per member you get to join
If the member(s) you get to join are active and deep in RP for 1 month you will gain an additional 500 Beli essentially allowing you to buy pretty much whatever equipment, abilities, etc you like