Hey, glad your enjoying the game. I'm also on Epona, currently Durst Andreas lvl 90 mage and only active member of the GrimLegion (at least as far as I can tell, though I still play with a friend who used to be clanie). I don't know if you found this, but it's been impossible for me to get into a good/active clan (not that I've been trying that hard but I have been trying). Not exactly a newb as I had a higher level toon before (aka rogue) on Taranis but I couldn't get him back. Anyway now I'm a mage newb at least and I figured I'd share what I've found most helpful.
For plat I think I'd recommend getting sigils, like more than anything. (Except if your going chests to sell for gold). So far on Epona they've been going for the biggest gold to plat ratio (though idk about chests) at the auction I haven't seen them for anything less than 2k a sigil. Some one told me they were selling for 5k, at first I though it must be a crate, but now I figure he must have meant per sigil. As a mage I probably spend half the time in combat and half running around so if I could get 40 sig for less than a hero ammy it would probably be worth it, and as a druid since hp doesn't matter the more energy the better
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. But that could just be mage mob killing time, I'm not sure. It seems to me that sigils are better, but if you want to do the math or have someone do it for you I would recommend that. If your grouping with your buds, it's probably even better to go sigils as you can have your vines and energy tick at the same time. Focus and ability/skill boosting amulets also better imo even at low levels
Master's grim is one of the best low level lux though. I would not buy an alt book as there are at least two you can get from quests if you haven't got them already, which aren't that hard. One is from the druid in catacombs and the other is during the tam lin quest. As for bank expansions you only need a few, I got five and have barely used half of the space, and if you can get a lot of gold from chests sell those and then get expansions for gold (if it's cheaper). Sell your junk to stoneval bericus or shalemont/OW (if it's closer) lux vendors to get the most gold for it.
Forgive me if I come off as an amateur optimizer... But I've found that mismanaging your gold, or plat can really mess you up early game and really give you a boost if you do it well, and popping elixirs... That's just a bad habit to get into.