Species and what to know as you buy them?

[DaylightFirefly]

As an inexperienced gardener I am curious, what questions should I ask a seller/shop as I am looking to buy a species orchid?

Most online sellers provide as much as a name of the plant and a price. I am now at the point where I make sure I know:
- the physical size of the plant;
- is it a meristem;
- does it or parents had/have awards.

Do I need to ask about exact parents of the seeds or a plant? How important is it to know polyploidy of the plant I am getting?

I really appreciate opinions and suggestions of all members of this community. It was for some time now and stays a very interesting and helpful source of information and peers support!

Thank you!