What advertising rates do you charge for a new site?

I recently contacted a few potential partners in my space regarding commission based agreements. One of them wrote back requesting to buy advertising on https://www.bitcompare.net and requested a media pack. It's our first week in, so obviously our numbers aren't huge, however, the value of the traffic is very high as it's so intent driven.

How do you recommend going about pricing? I want to keep them on as a recurring partner and set achievable expectations, however, I also want to maximise revenue.