Bob,
I have no doubt that someone here who has experience in breeding snails will give you all the help you need along the way. Don't hesitate to post any and all questions...
It's always interesting how sisters are a pain when young, yet become great friends when older. I hope that you and Barb shared great times together. I'm sure she knew that she was part of a loving family that cared for her greatly. What more could someone want from life.
While I did not know her, or even message on this board with her, I found her comments and love of her hobby to be an inspiration to me...to seek what brings joy in one's life.
Don't take this wrong, but if you are not able to keep up with her hobby, do not despair. None of us can take on the legacy of all those we love and pass before us. It is the memory we hope will go on.
I've not lost a sister, so can only pretent to understand. My prayers are with you and your family.