This is some source where you can find what you need to make your graphics..

hope its helping ^^

1)Deviantart

-you can find pictures and textures here

2)Dafonts

-you can download fonts here

3)Large textures

-can download many textures for your graphic

4)UlzzangAsia

-can find many ulzzang pics

5)Stocks

-things to add in poster

6)Celebrities

-kpop artist pics for ur poster

7)GAP

-to make animated gif using GIMP

-must also download THIS

8)Chick Brushes

-download Brushes for ur poster

9)GIMP 2.6

-Download GIMP here

10)Photoshop CS5

-Download Photoshop