New to me recurve, need arrows...

I bought a lightly used samick phantom as my very first trad bow. It's only 40# but I figure I need to work on my form more than anything else first. I draw just shy of 28". I'm looking at GT trad arrows but not sure if I should get 1535 600 spine, or 3555 500 spine. I know nobody that shoots a recurve that I can pick their brain about this. I'm not sure if this bow is quite cut to center or not, but I think that would affect my choice of arrow.

Ok, have at it please. Thank you.

Well, not knowing where you are from:

You can gladly contact 3riversarchery.com and get a test arrow package after talking to one of their experts. it will consist of a three arrow range that you can try based on the info from the bow [as you describe here].

Then after a short trial and error period get some that are best suited and run with it.....arrows do make a difference.