New WordPress site setup currently hosted with GoDaddy I want to install WP-MU

I just got my domain and hosting at Go-Daddy and set up the one step WorgPress.
I want to convert to WordPress-MU.
Is Go-Daddy a good server do I need to reset my server drive and delete my newly acquired WordPress.
Directions to help just installing the WordPress-MU on the Go-Daddy hosting or suggestions of perhaps a better host for WordPress-MU.

My plans are to offer airbrush artist their blogs under the main WordPress-MU I want to set-up, I do expect growth and media files so bandwidth will grow and attraction to consumers could make the usage really big, so I need to begin with economical bandwidth hosting .

Thanks,

Donald Warren