Melee+Range costs per xp

I'm trying to create a spellbook that would allow magic to compete with melee and range in pvm. To do this, I need to know, without counting any profit, how much gp/xp loss is it with both, using slayer, and the two best training spots for each, armoured zombies and aviansies for melee and range respectively. I also need to know the costs are in non-members, but I don't have any experience with high level non-member training, so don't know where to ask about.

I could do the math myself, but I would need to know the average damage per hit, and I don't know where I could get those.

While I'm asking questions anyway, I would also like to know what the big problems with f2p magic pvp are. That's the other problem I'm hoping to solve with this spellbook.

Thanks for any help I get.