Ooh okay,
i dont quite understand it all but its okay.

Let's just say it isn't that important especially now cause it's CB. :D So if you feel that it's taking up space... chuck it. OR you can go into Realm1 and see if anyone is buying them.

Oh okays,
another question,
At what lvl is soloing the instance dungeon easy?(15-25)
And they drop better lvl 15 armor. How about the weapon?
And if you get your armor to +3, should you get the lvl 25 armor or just wait to you can do the instance for that lvl and get it?
And are ethrelics only dropable by normal mobs? Is there a way to buy them or where the drop rate is increased?

It depends on the class. A full-tank Dragoon with a decent tank pet and a healer pet can probably do it around 21-22 without much problem, aside from the boss monsters. I'm a 23 Shaman with a crap tank pet and a decent healer and I ALMOST took down the bear boss by myself.

The dungeon will drop weapons too but you'll get it from a quest so don't worry about that too much. I don't remember what level I was but I was in my 20s and I was able to solo the mobs in there fine... no healer pet either.

There is not Lv25 armour... your next one is at Lv30. And you should get it asap... if you get a party you can just go through the second dungeon and kill the bears for gear.

Ethrelics are mob only drops as far as I can tell. But if you plan on getting star equipment the condensed etherelics drop frequently from instance mobs.

star equipment are from instance dungeons right?

how come when i was pumping my def at lvl 20, after three points its went dark and wouldn't let me add anymore into that stat?

It seems that it will only let you add a certain number of stats to one element in one go... not quite sure how that bit works yet.

I haven't actually partied yet, do the healer pets auto-heal party members, too?

No, unfortunately they don't. So you'll have to click on the party member and cast it yourself...