IMO pot lights in a 17’ ceiling are next to useless and especailly outdoors. As for size of fans and chandelier I would need the meausrements of the whole space to even begin to guess not to mention your style too.

^^ No they aren’t useless. Not everyone wants blinding stadium lights everywhere, especially in a gazebo.

OP, I would choose a good lighting company (experienced with outdoor lighting) — they’ll be able to come up with the best plan.

They aren't useless, especially if placed on a dimmer. Layered light helps create a great atmosphere. Another reason to go with a good lighting person for the fan size and placement at this point is to make sure you avoid strobing - if you're not careful, the fan blades whirling under a direct bright lights can feel like a carnival ride.

Your furniture placement plan and use of the space will help determine the height and placement of the chandelier and fans. For example, if you're going to place a long table in the center, you'll want the chandelier lower. I also suggest you avoid light kits on the fans, it will add visual clutter to the ceiling. Coach lights (sconces) on a dimmer are a great light layer.

If you post your drawings, photos of what's been built, how you plan to use the space and your climate zone, you'll cast a wider net for people to help you.