Originally Posted by
rdtompki
You won't get dropped. "Beginner" rides are almost always no-drop, slower paced (12-14 mph), no one will care what you wear. For a group this size there must be a ride leader. Speak with him/her about ride etiquette, etc. Agree completely with hanging in the back until you're more comfortable with the group and the group is more comfortable with you. Enjoy yourself.
One person's idea of a beginner ride will be different than someone else's.
Regardless, my number one advice to the OP is to introduce yourself to the group beforehand, let them know that you are new, and ask for advice, what is exepcted, etc.
Also, know the route and be prepared to fix your own flats, etc.