#1
my guitar has pretty high action on it its and older harmony sovereign i was wondering if i need a lighter string gauge on it or if i could adjust the trus rod and if so how would i do that
#2
Adjusting the truss rod to try and fix your action is just going to damage your guitar.

To bring down the action on an acoustic you have to file down the saddle or do a neck reset.
Not taking any online orders.