You can regain anima by doing Hamlet defense (100 anima if you win if I remember right) and chocobo caravans (you get some items your can trade in for anima).
Other than that you can just wait for it to grow back naturally at a rate of 1 point per 4 hours^^

GC seals are most easily earned through chocobo caravans (the high lvl version).

About arrows...using better arrows makes your dmg better by quite a lot but if you can't afford them you can use warped arrows until you hit 50 as well.