Welcome!
The "search" is a great option for learning on this forum.
1) A 55# bow is not ideal to start out with. Generally you would want a light weight bow. With less poundage you can concentrate on your form more so than drawing your bow. Form is key for accuarcy. I just bought "Instinctive shooting" by Asbell, it is a good read. I wish I would have gotten this book in the beginning, it would made the learning curve alot easier on me.
2)
http://www.bowmaker.net/index2.htm Check this site out for tuning infomation.
Hunting weight arrows should be around 10grains/pound of bow.
3) Practice distance. Starts close 10yrs and work your way out. Practice, practice, practice. Let your proficeintcy be the judge at what distance you feel comftable with. I shoot out to 35yrds but I am limiting myself to 25yrs for hunting because that is where my confidence levels starts to drop.
4)For me: Fair=hitting the target without any grouping whatso ever, Good= a 10"group, Great=4" group, Robin Hood= stacking'm on top of each other.
Just my $.02.
Tuning is easy if you know the proccess. Just inform yourself and stay at it. Good luck to you.