I love your optimism and I wish you the best of luck OP but I do think you will look back at this thread and laugh once your little boy is here. My little girl is 10 weeks old today and I had loads of ideas about what I would and wouldn't do, some examples include:
I would never co-sleep with my LO. That went out the window when I fell asleep several times whilst feeding her in the night as she needed to feed a minimum of every two hours day and night as she wasn't putting on weight quickly enough. I decided it was better to safely co-sleep in a planned way than risk falling asleep with her again. Once she settled down to every four hours I no longer needed to do this but it was the only way I could function at the time.
I would never give my LO a dummy. That went out of the window when I'd had hours of her comfort sucking on my nipples, so much they were bleeding
Now we have shed loads of dummies around the place.
I would be out every day taking my LO for a lovely walk in the fresh air. That went out the window when I had to have my lady bits stitched up and I couldn't sit down for a week, let alone walk anywhere ha ha. And now I'm lucky if I get out twice a week for a walk - no one tells you how bloody long it takes to do anything with a baby (actually everyone tells you, but you have no idea until that baby actually arrives.)
It's lovely to have all these ideals but realistically when they arrived you consider it a good day if you've managed to brush your hair and your teeth before midday 

On the subject of self soothing my LO does this, but completely by accident. I just left her in her cot whilst I got ready for bed and she went off to sleep by herself, and has done since then. But it was total luck - not any good parenting on my part.
The best piece of advice I had was babies haven't read any of the books, or advice or google and at the end of the day they are all completely different. What works for one won't work for another.
Oh and I would go for he under the sea theme 