Welcome to SR!
I think it's great that you will now be a sober dad to your 2.5 kids, what a great gift to them. Sobriety is something that we really have to do for ourselves, but the great part is everyone gets to benefit from our getting better, just like everyone has to suffer while we are active in our addictions. There are enough drunk dads out there, so I'm happy to see someone trying to do something different.
I would check out AA. Keep in mind that by going to a meeting you are not committing yourself to anything. You can just try it out and see what you think of it. I think everyone who struggles with drinking should check out AA if for no other reason than to have an opinion of it. Also, you are not obligated to speak when you go to a meeting. In fact I would recommend not sharing anything, but rather try listening to what the others have to say.
Best wishes in your recovery!