As long as you were running it easy then pace is to an extent incidental. You're better off running on how you feel rather than to a fixed pace because we don't really know what your marathon pace is yet. When you get longer (say 16 miles) we'll need to watch for you going too fast, though.
As for music, well I'd echo what Spoons said. By all means use it in training, but be prepared to have to run your races without it. Sometimes it's banned, and even if it isn't, a race is a completely different vibe to long miles on your own and better experienced without a backing track, IMO.
On that note, it's worth having a thought (maybe during your long runs) on what you'd do if things aren't ideal on the day. You might not be able to use music, your watch might give up on you before you start, you might drop gels, all sorts of things. Some people will panic when that happens, others just get on with it. They're the ones who have at least thought about what they'd do beforehand, so it doesn't come as a complete surprise.
I sometimes use parkruns as part of a longer run (anything from 10 to 20 miles) just to vary the pace and try something different. Although these days I'm more often taking my son to our nearest one. That's what we did this morning. 23 minutes is pretty decent, there's definitely some speed there!
Dave - do more experienced runners like you mentally prepare for training runs or do you just lace up and get on with it ?
I guess I'm closer to just lace up and get on with it, although longer runs take a bit more planning, if only to fit in around family life. You have to at least think about what you're going to do for that training run, and you still need motivation to get out of the door when it's wet and miserable outside!