What else will i need w/ this saddle?

i am getting a horse and have decided on this saddle: http://www.horse.com/item/king-series-synthetic-western-saddle-pkg/SLT901222/ and this girth: http://www.horse.com/item/nylon-fleece-girth/SLT771047/ is there anything else i would need for the saddle other than a saddle pad? and im about 5' 1" and 105 lbs, what size whould be right like a 15 16? any tips to owning a horse would be nice, i have rode many years and have tacked horses and such but never owned one, we moved out to the country so we have room for one now, tia! madi