Never played HC, seems tough to get to a point to be able to power level people without dying haha
Gotta look up legendary runes... Lower kurast chests is a thing in D4 too?
What about just farming a bunch of gold and trying to optimize on selling gold early?
Selling gold is THE gold idea. I try to make gold asap and sell it before everyone else starts selling it. Selling important gear is a fast way. Like, you can sell it on jsp or on the trade chat on D4.
Lower kurast is the best way to farm runes, and if you are willing, after you finish the run, there's a chest that contains runes (you need a special tribute to do the rune runes). You can get it through random drops too, or from lair bosses.
Legendary runes are really highly sought after, and if you can farm boss mats to get good gear, you can sell it for a lot of igg. Most things are cheap right now in the forums b/c the season is almost over, but when it starts, I see guys making so much fg through D4.
I really wish the best for you. For me, trading is what makes it fun in Diablo games.