Spence - I've been reading your other thread. Sorry mate, I know that's not much comfort but you're obviously going through a shitty situation.
When I split from my STBXW, it took me months to get my head straight - and that was without any affairs or anything, just low level EA and the fact we'd drifted apart. Still, being away from my DC, having to find somewhere else to live, reinvent myself, or maybe rediscover who I used to be, all took time.
I wouldn't rush into dating. Get used to being single again, things are very fresh for you and you're going to end up getting hurt. Friends, however, that's a good choice. There are things like MeetUp.com which isn't a dating thing, just events for likeminded people who like similar activities.
Only once you're getting over the shock and stress would it be fair on yourself to meet someone. Dating is a minefield and you don't need more potential anguish on top of what you've gone through.