Greetings,
I'm absolutely new to game developing and I have few questions.
Am I able to import models and characters that I've made in DAZ Studio 4 or does GameStudio only support Maya?
Will those models and characters be the same or will GameStudio decrease their graphic quality? And last question that I have is will the game be slow if the graphic is really good and if it has more than 1 GB?

Thank you all who are taking time to help me out.

Hi and welcome to the forum!

Gamestudio does not support Maya directly, you have to export Maya models, f.i. as FBX, import and save them in Gamestudio's native model format MDL.
I don't know DAZ Studio 4 and its formats, but I assume it supports 3ds, obj or fbx for export and thus you can import your models in MED.

If there are no problems with import/ export, their won't be any loss in quality (EDIT: Your model should not be high poly, that is below 10,000 triangles is ok.). It may be possible that your modeling program uses a specific material/ shader that you may have to recreate then.

This mostly depends on your knowledge and skill. The size of the game does not matter at all, you can make a game that's 1MB in size and runs at a maximum of 10fps or a game that's 20GB and runs perfectly fine.

Thank you for your help, I'll search the forum to see what hight poly & low poly is.

low poly means, the count of all triangels stays in a range of 2 - 12.000 triangels. 10.000 as a maximum is a good value.
Cause the more polygons are visible, the more it needs to render.. that makes a game slow too.
^^

in MED you can see the total number of faces can be checked in "File => model properties"

But it won't make the graphic loose it's quality?

you have to use normal mapping to keep the details of a high-poly model in a low-poly model

I don't know the full steps for it
but if you're really worried about low poly models looking bad
you could make 2 versions and do a high to low poly bake