Level 1 used to be a qualification that enabled you to assist with a beginner's course or other coaching. But in practice many Level 1s run beginner's courses alone, and that's tolerated by AGB, as there just aren't enough L2s and above to meet demand in a lot of places, so the L1 qualification was adapted a bit for that reason.
What you'll learn: mostly, how to coach the basic 'T-Draw', broken down into steps. The course covers other bits and pieces: range safety, warmups/cooldowns, equipment selection. Not much else.
What you won't learn: how to coach beyond the beginner's course, observation skills and how to correct faults, equipment maintenance, basic anatomy and biomechanics, coaching posture and alignment. All of that comes in at Level 2.
Of course, you can assist with coaching within a club without a qualification, under the supervision of a L2 coach or above. That's how mentoring is done for L1 candidates (I'm mentoring someone at the moment).
I'd chat with other coaches in your club to find out if they could use the help of another L1 in running courses.