Answers will depend on a few different factors (such as what kind of installation you are getting and the layout of your home).
For an installation with coaxial cable, a cable emerges from a plastic duct in the street and is shallow buried or nailed to a wall or laid on the surface and runs to an external wall box which is the termination point outside your home.
https://www.ispreview.co.uk/wp-content/gallery/2019-article-illustrations/virgin_media_external_wall_box.jpg
From there a cable is brought internally to a wall box inside where the equipment is connected. Equipment in different locations may need more connection points.
Cables are clipped internally (not under floors, hidden in walls etc.). You will need to state where you want the cable and boxes. The VM tech will try to accommodate (although the tech's aim will be to take the easiest/quickest route possible for ease of installation). Your cable may need to run internally or, depending on your home the tech may be able to run around the sides etc.
Search online for more installation videos
https://www.youtube.com/watch?v=2ccalPbJAx0
https://www.youtube.com/watch?v=NxlQTCZkeYU
https://www.youtube.com/watch?v=n32DQsyfoek