Best way to start drawing the layout of my flat

[MyFlatinB]

Hi there,
Have seen several intro videos and I am confident that I will be able to manage the tool in general.

But, all videos present just the features and many gimmicks re/ how to beautilize it but not a recommended process how to start a specific project.

Let's say I want to draw my flat. I have a printout of the sketch with the floors and walls and dimensions. All together it shows all the rooms of my flat.

So how should I start? Firstly, the whole outline of the flat? or just one room then attaching the other rooms? Or the walls first? Or the floors?

I did not find any guidance yet which answer this basis approach. My fear is that I may need many restarts as I might run into a dead-end where the measurements do not match.

Any guidance is very welcome. Thank you.

[SeppoV12]

If you have not seen this guide yet, good point to start is Starting a new home.
All 8 main steps are explained in detail.

Seppo

[VeroniQ]

You may find also some video for beginners in Sweet Home 3D Youtube Channel.

[MyFlatinB]

Thanks for your links. I will go through it carefully.