I'll echo what Brian said.
The problem with editing is that it's more or less the last thing in the chain, and often the first time that an inexperienced client will become aware of what they've really asked for and what they're really going to get. It can become a nightmare of endless tweaks and reworking. You need to be very careful about managing expectations in terms of both what you're aiming to create, so they aren't surprised, and the number of edit days in total that have been budgeted-for.
Also be specific about deliverables, formats, frame rates, audio tracks, etc. As an editor, much less an all-in-one production resource, you may find yourself becoming responsible for providing various outputs for them in perpetuity - one day they'll want it on YouTube, then YouTube and Vimeo, then they'll want a version for playback in some sort of exhibit kiosk off some sort of server you've never heard of, then they want to supply it to an external company that's doing the LED video walls at their event... it's endless and you need to make sure all that versioning work is chargeable.
As ever I find myself bowled over by the rates Robin suggests - he's shooting very high end gear, though. I wouldn't expect to get those sorts of numbers for an Ursa Mini and a pocketful of DSLR lenses, though you could do very credible work on such a setup.