Hello every one
I'm traveling from Amsterdam to Interlaken Switzerland
Then from Switzerland to como I'll keep my luggage in a store then after i finish my tour in como I'll go to milan in the same day
Any advises please its my 1st time
How can I know my seats for the trains that not required seat reservation
Some trains seat reservation recommended I don't know the best thing to do in this regard
Thanks alot in advance
Use bahn.de, it'll show when seat reservations are required + show you schedules. They are optional in Austria, Germany, not needed in Switzerland and not possible in Belgium and the Netherlands (except Thalys which should be avoided).
On such a long journey though I'd recommend to book a seat on bahn.de : 4.50€ for the whole journey.
The international trains between the Netherlands/Belgium and Germany are always pretty busy
When there's no need to book, simply add the train to the app before boarding, enter a 1st class/2nd class carriage depending on your pass and find a free seat 
It works that way in most of Europe
I'll book for the ast train should I book for the other trains ?
I'd check on bahn.com what the expected occupancy is, and based on that maybe book a reservation until Basel.
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