Hey, I have 2 questions.

1. when I want to create a new Country Leader, it says "desc =". What should I write there?

2. where can I find all the portraits and their names?

1) desc is a reference to a localisation id. 

So in a localisation file you may have:

CUSTOM_LEADER_DESC:0 "This custom leader has a description"

And in the focus file, you'd put:

desc = CUSTOM_LEADER_DESC

2) I don't think there's a definitive list out there unfortunately. You can look through the game's files to find the portrait you want for your country.

"PATH\TO\Hearts of Iron IV\gfx\leaders" has each leader split into the nation it belongs to.

When you find the one you want, in the GFX you should be able to use the path for the icon e.g. "leaders/BRA/Portrait_Brazil_Getulio_Vargas.dds" but most will have been given an internal ID you can use, e.g. "Brazil_Getulio_Vargas" may be what is used for the previously mentioned.

Hey, I cant find the "gfx" folder inside the Hearts of Iron IV folder.

nevermind, I found it :)