[Freeswitch-users] Newbie startup help. Tutorial? Learning path?

Hi, I'm trying to avoid taking up a lot of peoples valuable time. SIP & FS have brought some ideas for some commercial products but I need to know where to start. Having once written a proprietary DOS & helped with writing a RTOS, I consider myself capable of learning. I (we) just need to know where to start to come up to speed rapidly. Is there a FreeSWITCH tutorial available? Should someone new start with Asterisk and then possibly move to FS? Thanks, Merle