Not quite so hard as a G1000, since the PFD is a continuous display of the flight instrumentation. With cunning you could almost build one without a heap of coding, but adding navigational info makes it a coding job. The Garmin would be a serious project by itself, never mind the aircraft and VC modelling, etc.
There are tutorials on modelling, tutorials on mapping and tutorials on texturing. There’s none I know of on flight modelling, setting up the cfg files, getting your project into the sim or effects other than the SDK documentation, but this forum is full of people asking questions on all these subjects and sharing answers.
It’s too big a subject for one overall tutorial, so where did you want to start and what can you already do?
I see, Well there is the thing at the moment i am just trying to think about a aircraft that I would like to spend some time to model on, so that might take som time, but the thing i that i am new to fs developing so I don’t now anything.
Think long & hard about which aircraft you want to model as it will take up a considerable amount of your time! Also do some research, try & find a good 3-view aircraft plan image (top or bottom, side & front view), detailed photos (these will come in handy when trying to model a particular part) & technical data (dimensions & performance).
The first step to making your own aircraft for MSFS is getting acquainted with a modeling tool. Blender is the best choice since it has a MSFS export plugin, is free and works on Windows 10.
Once you have a basic model there, you can focus on getting it into MSFS.
Its one step at a time. Today, you make a wing. Tomorrow, you cut out the aileron and make the opening sections and walls and curved interiors. 3 days later is the flap. When you get the wing done, you map it (all the parts), then clone it to make the opposite wing.
One part at a time, one gauge at a time. If you have help, that really helps out tons. If you re-use stock gauges, that helps. If you have a gauge builder work with you, that massively helps. If you get permission to use someones gauge, that works great.
One day at a time, one part at a time. Tons of helping souls here to answer questions, and tons of tutorials on YouTube.
What program were you going to build it in? You need a 3D program (Gmax, 3ds Max, or Blender, etc). You need a painting program, like Gimp or Photoshop. You need an SDK (converter files, etc) for converting your work to model's for FS to use.