Turkulese, welcome to the club!
If you do not have experience shooting a recurve, the easiest method to determine your approximate draw length is to take a yard stick, hold it to your chest, and place your hands on either side of it palms open and fingers extended. Reach as far forward as you can keeping the yard stick to your chest. Search the internet for videos on how to measure your draw length for a recurve or longbow and you should find some good explanations on measuring draw lenght. 3Rivers Archery has a nice video on measuring draw length.
For a 50# (50-pound) draw weight recurve, you hac several choices in arrows. In aluminum (Easton Leagacy) I would think a 2016 or 2018 would work, but it depends on point weight and arrow length. For crabon arrows, a 500 will likely work pretty well, assuming a 29 to 30-inch long arrow.
I have included a link to a tuning guide to help explain how to set up your bow and select arrows.
http://bowmaker.net/tuning.htm Good luck!