Y'all are a Shichibukai. For right now, you can either fly solo like Mihawk or Kuma does, or you can have a crew of about 150 normal pirates which you can use as NPCs. This is generous, but all things considered the RP here is going to stagnate, fast, if some other player doesn't make more things happen.
So feel free to use this crew as you please, you're the captain and by far the most powerful. To be fair, I can't give you any more-powerful people, for obvious reasons, so just start somewhere and get going to whatever your character's goal is. Try and meet up with more people, people who seem to be either going solo or are working together in small teams.
Please note that all the following information is OUT OF CHARACTER. That means just because you read it here doesn't mean your character knows any of this information. Kira and Sumaru are just about to leave Loguetown, you could try and meet up with them. Lena has not formally become part of the Crimson Crew, perhaps a chance would make itself available to try and recruit her. Kant is working alone, Pete is just getting drunk in Toroa, so on and so forth. Just go out and look for people.