For my BW 52# @28", I shoot 70# spined arrows cut to 29" (I match my own spine). I use 125gn points and total weight is around 560gn. Spine will depend greatly on how your bow is cut (center, past center, etc), length and point weight.
The dynamic spine calculator will get you a rough idea where to start. I always tell folks to get a test pack of shafts from somewhere...lately I've been getting all my shafts from Surewood. Their shafts are really consistent and are straight as can be. If any need to be straightened, just a little adjustment is needed and I've never had to re-adjust. In your case, I'd recommend a test pack with 4 spines...60-65, 65-70, 70-75 and 75-80. Yeah, you have to spend some extra bucks figuring out what works best, but it's worth it in the long run.
Douglas Fir is a great wood for arrows. Cedar is good too and it'll be a bit lighter, but it'll be tough for you to find a wood arrow that'll fit your setup to come in around 500gn.
Carbon arrows are inherently lighter than wood, so don't be afraid to shoot something a little heavier out of that bow. I have a 45# longbow that I shoot 550gn arrows out of. You can barely hear a thing when I release. I get a lot more drop out past 30 yards, but I don't shoot animals that far.
If you have any more questions, feel free to PM me...more than happy to help.
Adam