Want To Add A Gunite Hot Tub To Existing Pool

[Empirercs]

I'm buying a house with an unheated pool and want to add a hot tub with perhaps some sort of fire feature. I like the zero edge tubs but I'm mainly trying to get an idea on what I need to prepare to spend. The pool is about 3 years old and salt. Natural gas is right beside the pool equipment

Also, where can I find a good designer to work with?

If I can figure out how to ad a pic I will if not I can email it

Thanks