One of the best tutorials for a new O/S installation on a SSD is found here: http://www.overclock.net/t/1156654/seans-windows-7-install-optimization-guide-for-ssds-hdds
I recently went to a SSD myself and found it helpful to avoid pitfalls and to get the most efficiency out of the SSD installation. After you get down to where it says "The installation of Windows 7!", you need to click open his links to see the good stuff.
A SSD doen't have to be 'formatted' because it doesn't involve tracks and sectors. But it does need to be prepped. And yes, AHCI mode is the preferred mode for SSDs. The tutorial gives you all the info and how to do it.