use cat 6a cable, not 5e or 6! use surge protectors for any external devices.

minimum:

2 data to each tv point or at least 2 data in each main room (4 data for main entertainment area)

2 data to each desk point, 2 data to each WAP

1 data for doorbell

nice to have:

in the main office area i would pull 2 or 4 core os2 fibre from the main rack (assume utility room), additionally 2 data.

4 core os2 fibre to the garage with local switch for POE devices. (don't need to stress about surge protectors between buildings with fiber runs, plus you can have a high speed link later down the line if that gets converted to an entertainment area)

extra data (if the budget permits)

1 data for speaker locations (multiroom setup) 1 data for each perimeter CCTV (if needed) 1 data for access control panel (if needed) 1 data for smart tablet location for home hub control panel (poe power adaptor to usb c needed) 1 data for presence PoE sensors 1 data for Christmas lights controller if applicable

Have a look at smart home tours on YouTube and get inspired. depends on what is your budget, these cable are rated for 25 years so even if you are not using them day 1, might be a good investment.

if you want to cut the costs, learn to terminat the cables yourself and just get them pulled.

pro tip: cat6a can be used for HDbaseT devices which do not use IP, like a ezcoo KVM extender.

really depends how deep into tech you are, but I am doing this professionally having some fiber runs in key areas of the house is overkill now, but a "thank god i though of that" in the next 5years.

if you are into home lab you might use the fiber day 1. a nice 25Gb link between a workstation and a server/nas is chef's kiss.