Hello Kuessattoo19
It’s my pleasure.
You can take your luggage on board the trains, there are specific baggage shelves for it. You could also have SBB transported your luggage, however it would only arrive two days later.
Luggage station to station. | SBB
What concerns seat reservations:
On Swiss trains, there is usually free seating, this is why your ticket does not have any seat assignments. Swiss trains are a form of mass transit, similar to suburban trains in other countries. As a result, you are welcome to take any vacant seat in your respective travel class. If you want to sit next to someone you don’t know, it’s courteous to ask if the seat is available before sitting down. You will see once you are here how easy it is to use the Swiss public transport.
Should you reserve a seat? Except for certain panoramic trains (PE), seat reservations on Swiss trains are completely optional and not very common. Swiss people usually make seat reservations when they would like to eat in the dining car, when they travel as a group of 10 or more, or when many travelers (e.g. holiday season) are expected. If you still want to reserve your seat, kindly note that this is possible for IC, ICE, EC, IR, RJX, and TGV connections only: Seat reservations in trains and dining cars | SBB
Kind regards,
Roland