See document timeline here.
Each country has their own rules regarding Visa. Please note, that you are travelling with your passport of your country of origin. Usually, you get a lot of information regarding the visa process from the host university. Nevertheless, it is your responsibility to make sure to have the needful document to be able to enter the country and study there.
For questions, please contact Annik Scholzen:
Mail: annik.scholzen@hslu.ch
Phone: +41 41 757 68 13