I have a hyfire I, the II is a great stove. YOu will like it.
Post a pic or two of your setup.
First, make sure your flue is clean and hooked up correctly (Not capped off or anything).
Is there a Baro Damper (Flapper in the flue pipe?
is it a DIRECT or POWER Vent (blower on the exhaust) or just hooked directly to a chimney?
Do you have working CO detectors in the house? (A REQUIREMENT!)
That the starting point. Getting ready.
Once everything confirmed, then we can help you get thru lighting it and operation.