SSO Graphics

I just installed GIMP 2.2 for WIndows 98SE. I have used Paint Shop Pro for years so I am familiar with some of the tools and the concepts but I am finding it difficult to find out information to use GIMP that make any sense. Some must be from other versions. I am trying to find out how to make what are probably png files so I can have transparent images. I am looking for a way to make something like tubes in PSP for GIMP.

im going to start using gimp to make my animations, and was wondering whether i could put sound (voiced by me) on the animations?
could i use movie maker, if so what format do i save the animation?
or is there an easier option?

I downloaded some fonts and brushes and i need to get them on gimp but i don’t know how.. can someone please tell me?