Can someone please help?

[somethingblue]

So I would like to add brushes and textures to my programs [I use PSP and Photoshop] but I dont know where to start.  I don't know the difference between .jbr and .abr and I don't know how to load them in there.  :(
Can someone direct me to the correct path for Blondes using programs?
Thanks in advance!

Sidenote - I was also wondering if someoen knew of a LJ like Icon_Tutorial except for WPs and Banners?  Thanks so much!
~Angie.