Importing sounds & textures

I am making a PWAD (for Doom II), and I need to know how to import 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 import 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

thanks.
I'll have a look into some of those programs you mentioned, and see
which one looks the best. I'll get back to you on the music thing once
I've found a successful way of importing stuff, that I'm cofortable
with.

Thanks again.

Peter