If it's a very solid idea, there are indeed venture capitalists out there. But on the flip side, I started DaniWeb with no more than $10/month web hosting, and all money that was put into it was from revenue generated. So it IS possible to be successful without an investment. It just takes that much more hard work and dedication.

It's also not impossible to learn as you go. When I started DaniWeb, I had no idea what web development even was (literally).

Arguably no better way to learn than to throw yourself in at the deep end.

Similar here. My host is dirt cheap - and I didn't know much about anything when I began.
Since delving into the deep, I've learned about php (not to any decent extent, but still, it's all about comprehending in your own time), how databases function, how to administer a site, how to generate a small income (ads) from it, and stuff like that... Some of my members have even willingly paid subscriptions to help keep the site going - subscribers get all ads removed from their view, so there's a good strategy...