Ask HN: How do I approach investors?

Hey guys. I'm at kind of an interesting point that I have never really made it to with any of my previous projects.

Without getting into too much detail we've developed a mobile application with some pretty heavy server technology behind it capable of gathering very interesting crowd-sourced information.

I have a few customers lined up now ready to go, however capital to buy all the tablets I need and continue to pay my developers while we build this is becoming an issue very quickly.

What should I be doing from here? I mean really all I need is $50k (for now), which doesn't seem like a lot, but to a startup corporation it is next to impossible to get that from a bank or lending institution.

I'm based out of London, ON and there isn't a lot of venture cap's or angel investors floating around up here.

Any advice would be appreciated at this point.