Adding a cam
I was looking at going with something like the BTR stage 3 kit, pushrods, and new timing chain, front engine gasket, and an ARP harmonic balancer bolt.
Aside from that is there anything else I need?
How long did it take to do your cam swap?
What can I expect to pay for a tune?
Good luck with it.
You could also consider a good quality aftermarket harmonic balancer. Reason I say that is because my buddy with an LS2 Vette had that known C6 LS2 balancer wobble happen to him. While there, not a bad time to replace the potentially problematic OEM piece with something else.
I would also consider a rocker trunnion upgrade especially with a cam that size. Some good ones to look into would include Straub and CHE.
The dyno tune cost will certainly vary but I'd figure in the $400 neighborhood.

