Najara

HristDead's problem is about third job auras, and your screenshot contains a trans/advanced job - which are defined by other files.
For pre-trans and trans/advanced jobs, you need to edit the following files: freezing_circle.bmp, pikapika2.bmp, ring_blue.tga, magic_target.tga

Do you mean the Cash Shop button? Or something else?
 
The Cash Shop button is located in data/texture/À¯ÀúÀÎÅÍÆäÀ̽º/basic_interface/nc_cashshop.bmp

Yeah, it's definitely a missing textures problem. Textures appear blank in browedit if it can't be found.
example here; I renamed the ToT3.tga texture into something that browedit isn't supposed to find/look for. The result is a blank texture.
 
As you can see, a large part of your map looks like that, so your iRO data does clearly miss something that the kRO data doesn't.
 
 
....Ah, got it~ the missing textures in your iRO data grf seems to be the "oldcastle" folder.
Extract the content in the attachment it in your/iROs data/texture folder.
 
Could you please report back if this has fixed your problem? Thank you.
oldcastle.rar

Indeed, what Chiron says, you haven't properly set the path(s) in Browedit/data/config/ro.xml
 
Personalize the following lines:
    <ro directory="C:\Path\to\your\RO\directory\">         <grf>C:\Path\to\your\RO\directory\data.grf</grf>

Unfortunately you cannot simply rename maps by clicking them, if you want to rename a map you'll have to use Browedit and save it with a different name.

You mean the display image and inventory sprite, correct? Is your custom valkyrie armor already added into your server?
 
If yes, all you need to do for that is open idnum2itemresnametable, locate ID #2301, and replace the #ÄÚÆ°¼ÅÃ÷# after it with #yourspritename#.

Have you only done the texturing and modeling? Or lights, gats and whatsoever as well? If yes, this would be a little trickier.
 
However, you could try doing the following:
 
Open your map > Edit Mode > Global Height Edit > Click ctrl + C > Check everything > Press "Ok"
Now open a new map > Pick your desired size > Click to paste your copied map into the new map.
 
If you crash, try to remove your lightmaps, that usually does the trick.

The community of rAthena board are mainly server owners and GMs that all dislike the thought of bots on their server, so chances are small that you will find any help here.
 
I suggest you to refer to the Openkore (or whatever emulator you use) forums.