Im****ting sounds & textures

I am making a PWAD (for Doom II), and I need to know how to im****t a
custum texture, so that I can use it for a wall or a flat. I've made
the textures in MS Paint and Adobe Photoshop and have saved them as
128x128px BMPs. I am using Xtentable Wad Editor.

Also, I would like to know how to im****t custum music (i have about
four MIDIs that I wish to use) and how to replace the image on the
game's title screen.

Thanks for any help

Peter