Instantiating an entire object at runtime

I have been having problems with instantiating multiple versions of a prefab at runtime, so I would like to try something else. I would like to create the entire object from individual assets at runtime, but I'm not really sure how to go about it.

Here is where I'm at:

In my start function, I am reading an external text file, parsing it, and creating a data array. I had been using that data array to instantiate a prefab, adding data to it, adding scripts to it, and then moving on to the next one.

I use a for loop to run each segment of the array, so I would like to continue to use that. I want to create an empty object, then add a mesh, a texture, and a collider.

Javascript is all i get, no C#. Thanks.