For best results share all bow stats. Make/model, string material, etc. If you plan on trimming the arrows down, I'd go with a .500 spine. Heck, even at full length I'd go with 500. Carbon recovers so quickly that its better to be on the softer margin of spine. You can certainly bump up the tip weight if you'll be trimming them down. There's a ton of info to pour through here, plus 3Rivers Archery has a spine calculator on it which is a handy tool to play with, just be sure to input all the data in exactly correct.
All that said, I find wood to be easy to get working for me, but a lot of guys have the carbon game down to a science and once you have the right formula its easy to keep at them. Good luck and welcome!!