I’m converting a screened in porch to a sunroom on a 1962 home in Central Ohio (Climate Zone 5A). After installing windows and framing the walls, I’ve pulled the old plywood ceiling down. I intend to take the joists down since they’re not structural and were only there to support the ceiling. I intend to convert to a vaulted ceiling. I’d like to insulate the roof so I can use it as a 4 season room/sunroom. Eventually, I’ll add a small wood stove in there as the heat source instead of running new HVAC. 

Is a hot roof the best option here? Or should I go with a vented roof? What are the best resources for DIY roof insulation in either case for my climate zone? Pics attached. Thanks!