Have you ever run wires before?
I ask, because if this is new construction, then it is extremely rare for a builder to allow someone into the home to run wires. The liability is that if you are inexperienced, you may not put the wiring in to code, and could actually cut holes which could require structure to be rebuilt.
So, you will need to familiarize yourself with the size of the holes you are allowed to drill, how far you should be from electrical pathways, understand you may not use the holes which high voltage is going through, make sure you are using in-wall rated cable, etc.
On top of this, you want to know what it is you really want to do and put together a game plan. It is good to come up with ideas, and generally the current rule is to pull cat-6 cable to any location you may want to use for anything in the future. IP cameras, security, video destinations, etc. all can work pretty well with feeds from cat-6 cabling. It also works as network cable should you need it. Some locations should get multiple cat-6 cable pulls to them (video locations, like TVs). Others just one (IP security cameras).
I've pulled for things like fireplace control, blinds, keypads, touchpanels, networking, phones, intercom, and cameras in my home with spares and future connectivity available should I need/want it. Wire is relatively inexpensive, so over-wiring is a good idea. But, you will want a space where you can properly utilize the wire, and typically in a main room, right under a TV or in a theater is a lousy location.
So, you want a game plan, and you want to be aware that this is a unique opportunity. If your intent is to 'sneak in' the wires, you better believe that the builder will see them, know they are there, and I have heard of builders ripping out wiring that they did not install, so be aware of that.