It's been a while since I properly used CMSMS as I've been fighting cancer. Cancer LOST

I have recently installed latest version of CMSMS and then Company Directory.
I am completely lost. Previously very experienced with CD and used it for lots of applications.
With no templates in design manager an no examples of {calls} in the module help, I'm struggling.
How do I call a summary template and then a detail template?
How can I get multiple summary and detail tpl's in Design Manager?
Why do I get image path faults when using the basic php in the standard templates?
I'm trying to update an old hobby fishing website which went stale a while ago. During lockdown, this is just what I need to keep my head straight.
I'm so lost, I'm actually considering wordpress (euch).
Please can someone share their knowledge with me?
Thank You
Simon