I'm using free program for resizing/converting my screenshots. It's called "Fast stone image viewer" and it has good set of editing tools. I also avoiding .npg format if I'm posting more then 2 pictures because they are still large in size. Therefore I'm rather using .jpg format.

I have an old version of paint shop pro I use and like. I won't matter the program as the work will be the same... open file, consider if I need to cut anything off, resize 80% so it fits on a screen smaller than mine and save.

I think the writing of the story will take more. I can do one liners and quick quips but I've never tried to actually do a long form story like this.  I also changed my mind a little bit on the theme of the story a little bit, but since no one has heard any of it yet, that won't make any difference.