@AuntieP glad you found your way to ATP! Just a suggestion - the cold frame idea sounds good! I could see that helping get a jump start. One thing I've noticed on the ground cover sedum - every stalk can be started as a cutting!! Its very exciting. If you are planning to have the dog in the back area, I don't think most things will be able to survive the running, scratching, stomping that a puppy is likely to do. (especially before they're really established) Maybe rows of potted plants might be better (along the paths or whatever?? Just a thought - I hate to see you do all that work, thinking these plants are "stepable" and have them not survive
Also come late spring/early summer I will have sedum cuttings I'm sure, and I can send them to you for postage. (love your post script, or whatever those are called - about the devil saying... haha!
Cheers