For most riders tubes are tubes (size and valve type), and tires can be slick, knobby, treaded, or hybrid. the main thing you need to look at for tires is max pressure, and width, wider tires require less pressure to support weight, narrow tires require higher pressure to support the same weight.
For mountain biking and being a Clyde I would look for a 2" or a 2.125" tire that inflates to at least 60# prefer 70# to 80# (many snake bites at lower pressures DAMHIKT) .
as far as Kevlar it is a good addition but always carry a Flat kit consisting of multi tool, tire levers, patches (and glue if needed for patch), tube, and boot material.