We don't usually discuss rates of pay in the public forums. You want to get yourself in the TilersForums Arms after posting a few more times to the forum things that we can discuss publicly.
Though you'll find you'll get the insulation boards and heating down, then self-levelling compound, pretty much in a day for that kinda size floor providing you have a whisk and large buckets for the SLC. Maybe a day and a half if the floor isn't very smooth and you need to do a bit of prep work before sticking down the insulation. But you want to try and level it on the first day so you're not wasting time waiting on the second. So stay behind if needs be to get it done.
So with that in mind, whatever your day rate is in your area, +/- 10 or 15% perhaps would be a good place to start.