I have watched the video on multi tenancy but I am a bit unsure of what ir
s required to actually implement it.

Do you require a wildcard certificate? And what is required as far as any IIS changes ?

Do you require to register a new IP address through any agencies eg
client is already available at www.acme.com.au does he need to register www.*.acme.com.au
.

is there a step by step instruction on what is required to set this up?
Any help appreciated