DDH I suggest that you get a copy of The Slow Fat Triathlete. While I know you're not planning on doing any tris, the whole opening part of the book is about how the author got started by walking....then jog/walking....then jogging....then running!! She's so great about sharing her experiences in a real and honest way. It's very motivating and inspiring. You could also go to her website which has many other great stories. http://www.slowfattriathlete.com/
I might also suggest that in order to try out different shoes (if you don't have access to any good local shops) would be to get a membership to road runner sports. If you have a membership with them (annual fee) you can try out the shoes (even outside) for 30 or 60 (I can't remember) days and still return them. No more wearing them around the house and trying to decide if they will in fact actually work outside!
Good luck and just try to enjoy yourself.