You will need a phase converter to run the 3 phase unit:
3 Phase Converter Info- Sales- rotary phase converter, static 3 phase rotary converters.
Do research on the converters to determine if you want to use one.
They work, but some electricians, hmmmm, don't like them. It's voodoo.
Put together a scope of work, include a sketch if possible, of all outlets needed. Ask each to size the feeder and connected load of the existing service.
Get three estimates from small to midsize contractors, to include all insurances, permit fess, and inspections.
Cost is up to many factors, too many to speculate cost.