- Extract potions. You're going to need some of these for yourself and in case you don't, someone else will buy them from you.
- World entry items. Map parts, Muster Card Ruina Station, Epaulette of the dead b1f/b2f, Seal of Darkness, Muster Card Forgetten Temple. Personal use or resale
- Plate of honor, which you might get at lower lvls from openning a chaos lamp.
- Epaulettes, of fighter, guardian or sage. If they're too low for you to use them, sell them to other players.
- Slot extender low, medium or high. Low is pretty sought after, medium is pretty commom now, and the high version is worth a lot of alz on all servers.
- Plasma coating kit, this can also be found in a chaos lamp at lower lvls now and you'd be temped to NPC it for 2 mil, but you can sell it for up to x10 on the market
- Astral board. Not much to say here. Everyone pretty much knows what they look-like and it's the reason why many sell everything they have to get one.
Not worth storing:
- regular armor or weapons, even slotted or upgraded. Until lvl 50, you can only NPC these kind of drops, however after that you get your transmuter and you can crush the items to get material cores and 1/4 of the NPC buy-back value. Lowest grade of armor you can crush is aramid or shadowsteel, citrine orbs and crystals, and lvl +30 jewels.
- NPC formula cards. If you're really desperate for alz, you could try to sell them, but my advice is to save time and NPC them.
Secondly, expenses:
1. Skills and upgrades. Each rank and the upgrades that are available with it cost up to tens of millions so you'd be advised to save some money in advance. Read your class section for skill guides and upgrade picks from more experienced players.
2. Armors and weapons. Don't worry much about armors or weapons until about lvl 40, when you can start wearing adept. Get a full adept set and the matching jewelry as soon as you can wear it. It pays to get a +4 skill exp set or +3 with a slot and upgraded it to +5/6 and wear it until you reach trans. It's cheaper to upgrade aramid/shadowsteel than it is to upgrade bluestine or titanium. +4 skill exp is also cheaper with aramid/shadowsteel than it is with bluestine or titanium, but if you can craft yourself a better adept set or someone in your guild or buddy list will give you a discount, go for it.