Planning of Power BI portal vs Sharepoint

Hi all,

im pretty new to power Bi, but fell in love with it recently. Usually my daily work is to manage Skype,Exchange and Office365. I have some Sharepoint Online experience, but lack of Power  BI.

I plan to setup Power BI in our company but dont know where to start.

There seems to be an own template for Power Bi in Sharepoint Online. There we can upload Power Bi files and connect to power Bi portal.

In power Bi portal, you can only upload files but not download?Its only used for show cases?

Is it ment to use Sharepoint/One drive for storage instead?

Is is best practise to have own server dedicated for Power Bi reporting?

What is recommended and not recommended?

thanks!