Italy and Switzerland are both Schengen member countries, so they have no passport controls at the borders. They only check on you when they suspect illegal immigration, or when they think you're travelling with goods that you should declare.
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You enter Switzerland when going into the main building. The passport check, if it takes place at all, takes anything between 5-15 min. If you are on a direct train from France into Switzerland, the passport checks take place in the train. The procedure shouldn't last more than a few minutes.
The residents of Switzerland are paid very high wages compared to other countries, even bordering countries like France or Germany. This is somewhat as a result of the high quality of living. But due to the high wages, Swiss people have more money to spend, which naturally leads to higher prices.
Depending on your nationality, you need a visa to travel to Switzerland. Only short-term visa applications (up to 90 days, Schengen visa) such as tourist, visit or business can be submitted online. A visa application can be submitted at the earliest six months before entering the Schengen area.
You must have a valid passport or national identity card to enter Switzerland. In some instances, Switzerland will accept a travel document that has expired. You can find out whether this applies to you here Overview of ID and visa provisions according to nationality.