Use 'to start with' when you want to begin a conversation on a specific topic. To start with, let's discuss the new project plan.
Pro Tip 2/3
List Introduction
'To start with' hints you have more points to mention, introducing an item in a list. We have several options; to start with, there's the summer course.
Pro Tip 3/3
Emphasize Priority
Implies what you're mentioning is the first in order of importance or relevance. Several factors led to his success, to start with, his dedication.