With my iksar in the past, I loaded up on spells I needed up to 29 lvl or so. That saved me from having to monkey with spells in ogre/troll cities for awhile.
You can also always create an alt for troll/ogre cities, and pass gems to the alt by ground drop to then sell for plats then buy your own spells, then drop them in bags to your character needing the spells.
If you got a friend that can buy spells then all of that isn't necessary...
One thing to know is once you can invis, you can easily bank in Freeport. You simply hide behind wall, where no guards can see you, rotate camera so you can view the banker and click him, then voila you may bank there.
I always brought my iksar to EC area as a lowbie, killed tons of orcs to work EC vendor factions, and then gathered tons of belts turning them in to WFP NPC for more faction with FP militia.
My iksar necro ended up able to freely walk through FP, no guards attacked me. The spellcasting NPCs still hated me though etc.
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