So I did in the end apply to Google AdSense just to find out. Turns out the site didn't get approved because it didn't have enough content on it. So I think you would be hard pushed to monetise it quickly by going down the normal display ads route.

I didn't mention in the post, but I had a couple of random ad offers, but they were for things that I didn't really agree with so didn't take up any of the offers.