How far are you going?

Regardless if touring or just riding, I always have a spare tube (for every size/valve combination on the bikes riding), tire levers, a pump, and if necessary, a wrench to take off a nutted wheel. Touring for anything longer than a normal ride I'd have a second tube, and a patch kit, as well as a multi tool with various hex/torx/screwdriver heads to fit the fasteners on my bike, just in case anything wiggles loose. Small adjustable wrench is handy too.

Make sure your pump can actually inflate your tires to the proper level. I like the Topeak Morph line of pumps, some of the department store ones just don't cut it.

Other than that, there is a Touring subforum here too, feel free to poke around and ask questions there!