The club makes a point of promoting ride leader responsibilities to new (and not so new) members and regulars. It’s an important gig, but it’s not all that difficult and you shouldn’t be afraid to put your hand up.
Many members of the group you lead will know the route, many will have GPS devices providing route assistance and many will have tons of cycling experience and pass it on at the appropriate time to other members of the group.
If you’re unsure about ride leading, watch your ride leader closely on your next ride and check out what they do. There is responsibility, but it’s really not that hard.
If you’ve been thinking about ride leading don’t be afraid to put you’re name down on the Ride Leaders page. You’ll be helping your club, you’ll probably learn a lot, and you’ll be well supported by other riders in the group.