Make it a habit to grab the pacifier nipple and pull it now and then to make sure that it is not broken or torn. This is particularly important when your baby has got his first teeth.
You don't want your baby to suddenly choke on a small part of nipple.
Don't use each dummy for too long, maybe a couple of months. They can become worn, get cracks and just stop being fresh.
A tip is to buy different colors or patterns at different times to help you remember how old the different baby pacifiers are. If not - well, you'll notice. They really do stop being fresh after a while. They can even smell bad. If your baby has had a stomach bug, consider throwing all old pacifiers away. Even if boiling should get rid of all bacteria, a fresh start can be a good feeling.
If you plan to carry your baby in a baby carrier or a sling, baby pacifier clips can be very practical.
This is true also when the baby gets old enough to grab things and throw them away. Not to mention when traveling by car and you can't reach out to help your sad baby who lost his dummy.
These days, some baby pacifier clips are like baby jewelry. You can get them in real silver, with the logo of your favorite football team on it, with cute Teddy bears, flowers and you name it.
Whichever pacifier clip you decide to use, make sure it is safe! (Not too long, so your baby can get strangled and no small, loose pieces that can be swallowed.) Ask in the shop if you are uncertain. They should not be long enough to wrap around your baby's neck, that is very important! Stay with pacifier holders that are no longer than about half way around your baby's neck to be on the safe side. Personally, I also prefer pacifier clips that can be washed.