Min Webhost spec for a WP Multisite

HI there, I've just put Multisite and will be providing blog sites per user registration.

I am needing to move webhost and am bit unlcear if I really need a dedicated server.

I was told I needed dedicated IP and SSL, is this correct?

If I can get this with a shared cloud host provider who offers upscale to dedicated vps for reasonable cost enough to ensure im covered for growth of the site?

Thanks!

Daniel