Still a big fan of Tuffy liners. Cheap. Not the lightest but way lighter than the slime tubes my sister had. Caveat: will not protect sidewalls.
Sometimes mountain bikers get snakebites (a double puncture caused by the tire hitting the rim-sometimes from running too low air pressure) while trying to find the appropriate air pressure to run.
Having constant flats would be aggravating but don't worry, you'll get the problem solved. Think of it as great tire changing practice!