I will write a linkedin post

There is no specific length that can be considered "perfect". What you do know is that the longer your posts are viewed, the more outreach they get. But this is also possible with strong theses and arguments in a few words.

It depends on you, the more active you are on the platform (networking, own comments, reply to comments, ...), the better for your reach and views.

I need your knowledge, your opinion or a link to an article about which you want to inform your followers and hear their opinion. I'm not an expert on all topics, so it's even better if you provide me with your thoughts in bullet points.

Yes/no questions are simply boring and only very few express themselves via LinkedIn with a "yes" or "no". That's why I ask attitude questions to stimulate discussion.

Yes, write down the link to the product and briefly describe the purpose and target group.

Yes, every eye-catcher is suitable for your post. The more people stop at your post when scrolling through the timeline, the more successful it can become, i.e.: reach. Search for suitable images on your photo platform and add value to your post.