Congrats on your little one. I think you are doing great! Just to address some of your concerns:
Personally I wouldn't worry about forming bad habits yet. Give him the paci, let him lie on his good side, get him sleeping and yourself eased off the stress of it and then you can deal with whatever you still may think is a concern. Like you say, they are constantly changing, so why stress about a habit that hasn't formed yet that may get broken on it's own one day anyway?
I still log my daughter's days from time to time. It gives me the illusion of control. That helps with stress. But also, as previously stated, sometimes the pattern emerges that you are not looking for. It's not what time he falls asleep but the stretches in between, ie: 3 hours since he woke up, so he's due to be getting sleepy again, or: he finished eating so he's going to fuss and then probably fall asleep after 15 minutes of that, etc.
Don't feel bad about counting down the minutes until nap time! I still do that plenty myself. It's only natural. It's so hard being a first time mom! Tiring, overwhelming emotions, hormones out of whack. Give yourself a break. Do you have any new mom friends in real life?
It's so awesome that he's sleeping at night, focus on and be grateful for that. He may always be a short napper, you will learn to adjust and deal with it, don't worry.
Hang in there and congrats again!
mom to one sweet little girl born in late '08
and -surprise!- one sweet little boy born in late '11