Help needed for CLEAN install Windows 8.1 on Vaio Pro 13

Hi, I recently purchased a Sony Vaio Pro 13 which had no operating system installed on the SSD and also the recovery partition had been wiped.

Now, I have successfully installed and activated Windows 8.1 but am very confused as to which drivers / utilities / software I now need.

My questions are:

1) Do I firtsly need to install Windows 8 (not 8.1) and then all related drivers / utilities / software for Windows 8 FIRST? At that point, do I then install 8.1 followed by all drivers /...

Help needed for CLEAN install Windows 8.1 on Vaio Pro 13