Suggestions for pvp training?
Why on earth would you war dec? It costs money that can better be used to help put your newer members back in ships more often. You don't have to spend money on a wardec to get pvp.
I know you are married to the idea of living out of Amarr because it has a market, but here is the best advice I could give you.
Move. To. Curse.
BPK, XX9, Doril, G-0Q2... any of these systems are great places to live out of. You want them to learn? Throw them in the deep end and make them lose a metric fuckton of rifters and ruptures. That 4m you used to wardec x corp could be used to buy 4 rifters.
Don't like the market there? I'm sure out of all the friends you have here, someone has a damn carrier or a JF. Buy a bunch of ships, fit them, rig them, move to Curse, pop cyno and now you magically have ships in Curse. You're honestly not going to be in a better area near amarr for quality small gang pew pew.
Low sec mechanics =/= 0.0 mechanics. Lots of fights in low sec happen on gates. You don't have the membership with the SP to be able to survive fighting on gates. Plus, you're also kind of forcing them to kill their sec status.
So "That's why we wardec. So we can shoot them in low sec without the sec hit." right? Wrong. When you war dec a corp and only go after them, you're limiting your target base. The best way to train a noob how to fight is to put them in a position where they have to fight everyone they run into. Stick them in 0.0 and make them learn to pay attention.