2. The adverse selection here is really really high: if you could generate alpha, you would find some capital from a big multi-manager or allocator (which is incredibly easy to get these days), and just focus on running their money. The fact that you are making a retail focused site instead of raising private capital says a lot.
3. Looking over the trading algorithms, seems pretty clear that you don't have a background at a prop firm or a quant hedge fund? It takes years to learn this stuff, and the only way you can reasonably do it before going out on your own is at an established shop.
Sorry to be a little harsh, but something like this is never going to work and no one in their right mind should allow your algorithms to trade for them. Generating alpha is incredibly incredibly hard, and teams of experts often spend years working on it with nothing to show for it.