Install the SSD in position 2 in your Mac Pro, boot from normal drive, go to Disk utility and the SSD should appear there. Select it, erase and zero if you wish, format Mac OS Extended and into Partition and set up as GUID.
Then install Lion onto the SSD assuming you copied it to a thumb drive prior to laptop install. if not, install Snow Leopard on the SSD as a clean install, not cloned, update to OS X.6.8 and go to App Store, hold down Option and hit Purchases and download Lion again. there is no additional charge.