If you're just starting out with bees, chances are you're going to want some tropical bees around so that you can get woven silk. When you centrifuge silky propolis, in addition to a silk wisp, you may get a bit of regular propolis too. Stringy combs are ultimately the way to go, though; if you want them earlier than you can get to the industrious branch of bees, you might be able to find/breed a beekeeper villager who will sell them to you.