How do I make simple interactions with my fbx file assets?

Development Programming & Scripting Blueprint
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1

I am a beginner on unreal engine. I imported the an fbx file on the unreal engine level. I really don’t know how do I interact with the door assets of my fbx file (tried to upload on this site but it would not). I want to turn the door handles. And when I import my fbx file only 1/3 of the door is visible, rest of the door is submerged in the floor & not visible. Message log says that my doors have near zero normal which can create issues. I know it’s a lot of questions but I’m really new on this environment. I have spent like days by reading online documentations, doing beginner tutorials, and playing around with the unreal engine on my own but couldn’t make any progress. I really don’t know how can I move forward. I’m stuck. I would really appreciate if someone can lead me to right direction. (P.S.) I’m intermediate level C++ programmer. I did understand Unreal C++ when I read the documentations. However, when I imported the fbx file and started working with the actual unreal engine environment, I really couldn’t wrap my head around & make any progress.

2

Your door being in the ground isnt much of an issue here, that just means the center of your model is located in the very middle of the door. When you place the door anywhere, just drag it up and out of the ground so it looks correct.
If you want interactivity, you’ll need to make a blueprint and add the door to it, then you can add the functionality of door handles and opening things. Here is good string of tutorials for this.

As far as "in engine" animation goes, you can separate your door handle from the door mesh in your modeling program ,import them as 2 different assets, then use (Timeline, Blueprint rotation nodes, or sequencer) to animate the handle when the player uses it.
3

would you mind making some screenshots or a small video and post it here?