Based on information from the leaflet that IKEA attaches to the three when sold, the three is a Ficus Microcarpa Ginseng. After reading information on this site, I understand this means it has been grafted with leaves from another species of tree. So what kind of tree do I have??? Can you just graft and create another subspecies?

Also, when searching the internet to find out what this tree looks like au natural/IRL, I just get pictures of other Ficus Microcarpa Ginseng bonsai trees, not he ones IRL, so how can I then know how to prune it? As I understand, bonsai is all about making a tree that looks like a miniature version of the tree IRL. Am I correct? Or mistaken?

Could you please post a picture of your tree so we can help you with more information?
I guess some people here can be much more helpful than the leaflet from IKEA.

Eyzteinn wrote: As I understand, bonsai is all about making a tree that looks like a miniature version of] the tree IRL. Am I correct? Or mistaken?

You are correct and it seems you already figured this out yourself: Ikea does not sell bonsai.

(there is no need to post a picture)

I guess you have fallen in the mallsall trap:
www.growingbonsai.net/glossary/mallsai/

The base species is as far as I understand, ficus microcarpa:
www.growingbonsai.net/ficus-microcarpa/

Mallsai instead of bonsai. Brilliant! It might still be a fun learning project though.

If the tree/plant is agreeable to pruning and moderation, can it be made bonsai?

Eyzteinn wrote: If the tree/plant is agreeable to pruning and moderation, can it be made bonsai?

I am afraid that UNLESS you live in the tropics, this will not be the ebst of ideas. Enjoy is as it is. And look around a bit on websites to learn what you need to start growing bonsai.

Eyzteinn wrote: Mallsai instead of bonsai. Brilliant! It might still be a fun learning project though.

If the tree/plant is agreeable to pruning and moderation, can it be made bonsai?

Nope. People with much better skills than me have done it, but I find the result mediocre. For a beginner it is unfeasible. You can trim shoots that get too long to maintain it's shape but that is about it.

I do expect it does not concern a ficus like on lb's picture but the one with the fat roots.