Start by introducing the basic concepts of TTRPG and D&D.
Make simple characters (level 1) or use pregenerated characters.
Explore more advanced character options later with after experience.
Your first session will be to plan, choose an adventure
and create characters - "session 0"
Create a simple plan and follow it to maintain a pace
that keeps interest without feeling rushed.
Keep notes as you play!
You will likely be the first club gamemaster or dungeon master!