Why not try Freelancer.com or Elance, one of those type of sites. Surely you can find someone skilled, with past experince easily viewable, looking for something a little more "ongoing". Best of luck with it!
Congratulations on the launch of your Beta testing! That is half the battle. My advice would be to slowly do another round of Beta testing and inviting people who you know will give you good feedback and help you improve your app. Then in the mean time get PR to pump up your app again for launch ...
a) are you good at selling? b) can you afford to hire someone? c) do you have time to sell? Until you can afford to and literally don't have the time too, my gut says do it solo.
So if I understand correctly you're building your own fund and you're trying to raise capital to make investments. Building your own fund is a very complex process (I know, I did it with mine). You will need to get a law firm to help you build the GP docs and the LP docs: NDA, LPA, SBD, PPM, Ter...
I would need more details to understand that nature of your product but i would encourage the following exercises: 1. Pre-sales: the ultimate validation is getting people to agree to pre purchase your product. What I mean is actual exchange of money. This can be done through kickstarter or less...