If you are looking for foreign channels, you can buy boxes already set up for you or you can buy a box and package(with instructions) separately.
Think of an Android box as a Smartphone… if you want an application, you have the option of installing it. So if you want a Browser… install one. But likely you won’t be viewing via a Browser…
An IPTV package can be installed to your Mi TV box. Also worth getting a remote control with a keyboard or an Air Remote.
It’s not unusual for older people to struggle with these things as they want to figure it out for themselves.
We are here to help. Don’t be shy in asking even what you might regard as the most elementary of questions.