Installing SP3.x under Windows
Time limitations mean there is currently no "new" information on installing SP3 under Windows (namely IIS).
Therefore it may be worth consuming the old page https://wiki.cam.ac.uk/raven/Installing_SP2.x_under_Windows
- noting that the architecture of IIS in its latest forms has changed. The pages on the shibboleth wiki may be worth reading:
https://wiki.shibboleth.net/confluence/display/SP3/IIS (and sub-pages therein)