I would go with about a 6.5" to 7" brace height.I had one years ago and that was the range that worked for me.For arrows I would try a 2016 in aluminum or a 500 spine in carbons.Like GT 35/55,Beman ICS or MFX 500 or any other 500 spine arrow.Start full length and trim and tune with the weight you want upfront.Your bow is 64",get a string for a 64" AMO bow which would be a 61" string.When I make up a new string for my bows,I like to measure the actual string at the brace height I want.Or if I don't have the old string I'll measure the bow from nock to nock to make sure of the actual length.