Hi Celil:
Is this a real world airfield, or a fictional one ?
If it is a real world location, would you please post the ICAO / IATA code for the airfield ?
Also, please state which numeric (Year) version of Sketchup you are using at this time.
As
Nightstalkernor posted immediately above, you can continue to base your project creation primarily in Sketchup.
If you just want to get started with a basic workflow, Sketchup can export your 3D model using a Google KMZ file type.
That KMZ file can be imported by MCX for processing into a basic glTF (Khronos 2.0) or a MSFS 2020 / 2024 format.
MCX can help you work with adding PBR texture Materials for MSFS glTF export files using any 3D file it is able to import.
If you want to work with PBR texture Materials inside Sketchup, you may need to install Ruby plugins scripts / extensions.
If you wish to use plugins / extensions with Sketchup, I recommend doing so by downloading the free Sketchup 2017 "Make".
I can post a link to that later today when I get some time, or
Nightstalkernor may recall the link location from in the forum.
Only certain plugins / extensions are able to be used in Payware versions of Sketchup released since Sketchup 2017 "Make".
If you are using a 'current' free online version of Sketchup, I believe it does not support use of Ruby plugin scripts / extensions.
If you require more info to get started, some of us here who are experienced with Sketchup can help answer your questions.
It is not required that you install and learn Blender at this time to make add-ons for MSFS; each workflow has its pros/cons.
Sketchup exports several 3D file formats that are able to be imported for processing by Arno's ModelConverterX (aka "MCX").
https://www.fsdeveloper.com/forum/forums/modelconverterx.87/.
I would recommend downloading / using the latest 'development' version of MCX:
https://www.scenerydesign.org/development-releases/
Please state which version of Windows you are using, so we can advise which runtime downloads may be needed for MCX.
Be sure to read the MCX PDF manual, which is in the root folder after you extract it from the ZIP file.
ModelConverterX (aka "MCX") can export your Sketchup 3D model into a MSFS project folder chain (required by MSFS SDK).
After the MSFS project folder chain is created, MCX can process your 3D model and textures into formats used by MSFS.
After MCX processes your 3D model / textures into formats used by MSFS, it can export files to your MSFS project folder chain.
One must then use the MSFS SDK DevMode GUI Scenery Editor to compile (aka "Build") the project for display in MSFS.
You may wish to use Google Translate to make things easier to understand in your native language:
https://www.google.com/search?q=tra...NC41uAerCMIHBTItOC4zyAdC&sclient=gws-wiz-serp
https://www.google.com/search?q=tra...NC41uAerCMIHBTItOC4zyAdC&sclient=gws-wiz-serp
Good Luck with your project.
GaryGB