Best Approach to Achieve this with WordPress MU Plugins

Hi,

I would like to setup a WordPress MU website, where the users can AUTOMATICALLY register and setup an e-commerce shop.

They could have sub-domains such as abc.mydomain.com

I would like to keep it simple, ONLY with the basic things the users need to do to run their shop.

Can you recommend the best approach to do this with the WPMU Plugins?

Thanks, Best Regards,

Santosh