[iDemonix]

It's entirely up to you how you create the end product, but the thing with clones is typically they're a bit clunky and are designed to be a clone, not to be something easy to use and modify like WordPress. I have no exp. with Airbnb or its clone so maybe that's a good system though, would need researching.

It's hard to clarify not-too-much as I've been out of the freelance game for a long time. I think your best bet would be to come up with a design mockup, and a good chunk of information about how you want the site to work, UX, user flow, that kind of thing, then approach some developer circles and see what offers etc. you get.

Places like Ask HN, or Reddit's /r/webdev would be good places to post a plan and ask for quotes maybe?

If you think this is a solid business idea though, I wouldn't try and do it on the cheap or bodge it on to a framework it doesn't fit with, otherwise you'll be worse off down the line when people have already had a bad taste of your brand and don't come back.