This is a great topic and I hope any gay, bi, or trans, dads will chime in. I'm a married gay man but marriage equality came too late for children to be possible or practical for us.
I really wanted to be a parent, but if I'm truthful I think being a parent would have been as much a challenge as it is for any other man. Being a survivor means I look at children approaching the age when I was abused and feel a lot of very protective emotions. I doubt the experience is much different for straight dads and I know there are many who would talk about how their children presented feelings and challenges to them. It might be worth talking to all the fathers here to get the broader survivor's perspective.
Canada has marriage equality and adoption available to gay couples so you are right, going to graduate school there opens up new options for what's possible in your life. There are some community resources you might want to read to get a feel for the reality for adopting in Canada. Canada Adopts has a thread on adoption for gay couples
on their web site that is worth looking at.