Hello. I'm bying new pedals w/ clips and shoes. It will be my first pair of this type. What should I check or to make sure of when I'll be buying them?

I saw there are road and mtb pedals. Shoes are different too. Will mtb shoes fit to road pedals, or vice versa? What is usually more expensive, MTB or road? I guess MTB pedal suppose to be very solid, what is more confortable?

Maybe someone would recommend me their favorite pair shoes and pedals.

thanks