I just started playing today and so far am loving every minute of it. Since it is in Korean a lot of things are confusing.

I just noticed that there are 4 items in my inventory that have a ? over them. What are these for and how do I use them?

Those are unidentified items. You have to take those to a vendor and get the identified. You can do that by using the "?" button in the vendor's window. It will cost you 100 zeni per item though.

But don't bother identifying any items below level 30. They willl waste you zeni. Just throw these away.

Ok, thanks alot

Is this info in any of the guides? I see this question asked like every other day lol.

Na, it's not in any guide. It should be easy to find one of these threads with the search function on the forums though.