Most people who want to become a coach get stuck deciding where to start, not because the path is unclear, but because there seem to be too many valid starting points at once.
Here is a simple path from deciding you want to coach to actually coaching your first paying client, in the order that tends to work.
Knowing roughly who you want to coach shapes which certification is actually worth your money. Choosing the qualification first often means paying for breadth you never end up using.
Coaching friends, family, or discounted early clients before you charge full price builds the practical skill a certification alone cannot. Treat this stage as training, not as a business yet.
A simple public page and a single package are enough to start. Waiting for the perfect offer before launching just delays the real-world feedback that actually improves it.
Your early clients will tell you, directly or through their behaviour, what to refine, what to drop, and what to build more of. Listen to that more than to advice about what a coaching business is supposed to look like.