Get yourself on the Easton Website and check out their shaft selector (hunting arrows) then get yourself on the Merlin Archery site (nothing to do with them, just cheapest place) and order some Easton Powerflights, they are carbons but they are cheap and because they are cheap they have a high glass content therefore tough, really tough! I suspect you will need a 500 spine from a 38lb curve depending on point weights but you can get all that from the selector chart, anything else the nice folks from merlin will help you with. Gamegetters from bowsports are still on a deal I think which are really cheap but get a glancer/bouncer/miss and get a tree or rock then you have a bent 'un. Alu's bend and woods break and I have found as both a field archer and a yorkshireman (i.e. tight!) that Easton powerflights easily work out as the most cost effective arrow on the market in the UK that I know about 'cos if a carbon is still in one piece its straight and these babies laugh at trees and rocks and you should be able to knock some up for about £4.50ea but ready mades from them are about a fiver (plastic vanes)
Spine is important but less important if your bow has a cut out beyond centre so the paradox thing is not as important and you get balance it up with point weights but still, get it right and it makes a helluva difference.
Hope my two penneth helps