Do you mean window shutters? What sizes do you have?
Window shutters are window shutters. Go buy a door and be done.
If they are shutters, you’ll have to glue & screw then together. I’d use dowels, wood glue and very large furniture clamps.
You can rip down the styles & tails a bit, but not a lot. That’s where the hinge butts need to be set with a chisel and the door knob assembly bored in.
Boring a new set of holes for a door knob is a lot of work for a beginner & I would investigate finding some other “latch-type” cabinetry hardware alternatives.
I would buy a pre-made jamb set, unless you’re making a custom-sized door and you’ll need to cut jamb stock down. Take note on where the pre-made jamb sets’ hinge butt locations are - to align with yours.
If your time is worth more than $10 an hour, I would not go for a custom-sized door.
Regarding “time & materials”: These pre-made doors below, are already hung in their jamb sets and already drilled for doorknobs.