all sata connecters have a name between 0 and til how many you have like 5 as example ( total of 6 sata slots )
so, if you have you HDD connected to sata-0, it is an no brainer to add the SSD to sata-1.
But doesn't formatting a drive wipe it and partition it. Making windows impossible to install?
and as Skynet explains, you need to format the SDD first to be able to make it bootable.