I need to get quotes on some fantasy game miniatures

Hello, I'm budgeting for a Kickstarter campaign and would like to produce a series of four high quality miniatures for the purpose of mould making for limited runs. I have some concepts sketched up but would be keen to see whether we can work together on this, communicating to develop the concept, or whether is simply a matter of writing a brief sending the artwork and you taking it from there. Since I'm at the budgeting stage would also be interested in how much you'd charge for each model as a unit, which would be very helpful. Best Regards Tudor