Need some help and advice with a setup.. thanks

Here is the story.

I have a head office with secions 1 is factory with about 30 pc and office with about 10 pc

I have other location through out the province. These location are Retail stores with 1 Manager pc and 5-10 Point Of Sale PC. And a server that the pos connect to for the database.

I want to setup this whole thing with Domain Controlers. Now The POS software i use gets constanly updates, and the way the update works is, the server get's updates. once u connect 1st time, the clients also have to be updates. This is not so bad now, but because we are growing fast i need somekind of automatic solution for this.

I'm gona be using Sonicwall http://www.sonicwall.com to connect the sites together with VPN tunnels. and creat access rules.

I'm using business internet with 6 mg download and aboug - .8 mg upload.

I will want an ftp server in my head office that i will dump the databases from these location into.

So what would be the best Domain senerio for me. Any input is greap. so please......

Thank you