If you have your RAID 5 configuration done, then Install SQL Server in such a way that
* Have SQL Server Installation files in one drive
* Move your tempdb to one of the drive and split it into files of size equal to the processor count ( Can be done after the installation)
* Move data files of user databases into one drive( Can be done after the installation)
* Move log files of user databases into one drive( Can be done after the installation)
Kindly revert if you don't know how to do any of the steps so that I can help you out on that.
