I have added answers for your second question to main topic.
See screenshow below:
What do you see on screen please check for "numbers in cyan squares"?
Server DB path depends on your mechanic (RENEWAL (runserver.bat) or PRE_RE (runserver_PRERE.bat)) you enter path via browse icon to your rathena items, in my case i'm using RE database, and as you see i have path to db/re/ files
Then, you need drag'n' drop with next priority grfs to Resources files folder. Drag and drop in next priority. Btw, you can right click on grf and change order for loading grfs in that field
Then, you need set for SDE where is located your Lua Files (it's item description for ro items), in my case see screenshot
Then, do not forget to change Client Encoding and Server encoding to use always Korean characteres insteed of broken cp1251, or cp1252 encoding.
Then do: File -> Save Project Info. (just to save all options and manipulations which you have done with SDE)
Done. Now you can click on different tabs and edit your items \ etc in GUI (see screenshot below under spoiler)
Btw, you can set even much more settings for your database if you will extract your lua files from rAthena2017.grf and will load lua files to "Lua Settings" window (see screenshot below)