Serse, so happy to have you join us!
Your potting mix is close to mine. I use potting mix, perlite and chicken grit. If you use sand, just make sure it is very coarse to allow for good drainage. Fine sand can turn into a hard mass and actually prevent drainage. They're pretty tough little plants. I'm in Wisconsin and mine make it through our brutal winters just fine.
Stay tuned - in March theres going to be a Sempervivum Week on All Things Plants when lots of great articles and information will be featured!
Yes, there are some great on-line nurseries to order plants from. I see you found SMG, which is one of the best! Here is a link to some other good ones:
The thread "Succulent Nurseries" in
Sempervivum forum How fun that your Dad is also interested!
I'm looking forward to your pictures too. Can never have too many pictures!