I need to know what length string to put on this bow? 52 amo,40/45#,also what is the correct brace height?  

You will need a B-50 flemish that is 49 inches. Mine liked a 7 7/8 inch brace.    
Nice bow, mine was a good little shooter. It was my first trad bow which I had harvested my first buck with.  

i second what arwin said.i have one that i bought for 8 dollars when i was 8 years old.it's my go to bowfishing rig.i've killed many of carp with that little bow.have fun with your bow,steve