Not really got any tips on online dating for you, however i was in a similar situation albeit i was younger, i got married young (21) and had 3 kids by the time i was 25, we were together for 7 years, but grew into different people, i was fairly normal and she turned into a bit of a nutjob, she cut me off from a lot of my friends and i was pretty isolated.
Queue me now finding myself single with 3 kids and a divorce by the time i was 27.
i didnt think i was ready for the next relationship, however i found a lot of my old friends on facebook, both male and female and reconnected to get my life back, i arranged drinks with people who i wouldnt have normally hung out with just to get me out of the house, i joined a gym to make myself feel better and lose a bit of weight.
3 months after moving out i went for a friendly drink with a girl i used to go to college with, funny story i asked her out at college and she said no, 10 years later we are still together, married and have 2 kids.
Moral of the story, whilst you think you’re not ready for the next thing, you might just meet someone who makes you think otherwise.