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1. what is the most safe width between main line and siding in my concept?
2. what is the most safe width between main line and main line in my double
tracking layout concept?
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Firstly you need to use this table to determine if the longest cars on your layout are A,B or C. This is because long cars require more space between tracks on curves.
http://www.morop.org/en/normes/nem103_en.pdf
You can then use this table to determine the spacing between tracks. Remember, the distance between tracks on curved sections must be greater than on straight sections.
http://www.morop.org/en/normes/nem112_en.pdf
These measurements are the minimum allowed. It is normal to have a slightly wider space between sidings and main lines to allow railway workers to walk safely.
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3. what is the most safe length of siding and main line in station platform?
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The main line and sidings can be as long as you wish. Decide how long your trains are going to be and then make the platform 1 or 2 cars longer than this.
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4. is it necessary to consider fouling point like if we concept a true station?
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Yes. Just the same as a real station.
It is unusual that a beginner to model railways should be asking about fouling points. Do you work for the railways by any chance?
***** The measurements in the tables are for European model railways such as Fleischmann. If you decide that you are going to use North American trains you must use the measurements in these tables as the trains are usually much bigger.
http://www.nmra.org/standards/consist.html#standards*****
Hope this helps you.