I know you'll know this, but it is worth checking with your local running shop about shoes. Not all shoes are built the same, and, for example, I find that many rub on my big toe. Buy online if you want, but check them out in the flesh first! Plus the shop should be able to recommend some you haven't thought of, too.
As for stretches, I find standing on the edge of a step will help with stretching the calf – before and after running. Do it slowly and carefully, as you don't want to damage the muscle, but it's a start. Afterwards, you can also use a rolly thing to really get into the knots in the calf and ease it out. Well worth doing IMO, as tight calves can lead to shinsplints and/ or achilles problems.