Both satellite TV and satellite internet will be fed from (separate) dish antennas on the south side of the house. These will need an unimpeded view of the Southern sky at about a 45 degree line.

Consider trees today and in the future. If you have a tile roof or a flat roof, or if the house is to be stucco sided, the installers will want to set a pole in the ground for the dishes. Frankly, a preset pole is preferred anyway since that will be best for any maintenance down the road. From your point of view today, just be aware of all that and be sure that pre-wires are as close as possible o the dish site. Installers can set the poles.

Regarding wires in the house: Each device you install - be it a satellite receiver or an internet modem, will require a "home run cable" to the outside. Thus, if you have ten such outlets in the house, you must have ten cables outside near the dish site. Television and internet systems cannot share cables. Cables are all good quality RG-6.

Regarding receivers and modems: A high definition satellite receiver, a standard satellite receiver, and an internet modem each require a single cable from the dish. If you think you might want a DVR (TiVo) or  two, install dual cables for that kind of unit since a DVR is actually two receiver circuits in a single box. Also, if you think you might want a DVR (and, you do) place a telephone outlet next to each dual cable outlet where you might want a DVR.

You have not said how large your house will be. If there are many rooms, you could end up with a huge mass of cables all running to the outside dish site. This is not a good thing. In the case of many cables, run them all to a closet or to a protected place in the garage. From that spot, run five cables to the dish site. That junction will be used by installers as a switching location for satellite TV. Be sure there is an AC outlet there also. And, try to keep the runs from dish to outlet under 100' if you can.

Special note: although each TV will have its own satellite receiver, there will only be a single satellite internet modem installed. For my money, I would have it installed in the master junction location I just described. There are two ways you can distribute its internet signal to your various rooms where you might use a computer. One way is to distribute via Cat5 (either-net) cable. One cable to each room from that control center. The other way is to distribute the signal via wireless. In either case a router is needed (common item) to "split" the signal. If you wish to do it wirelessly, you need a wireless router, but check with someone like a Best Buy regarding their recommendations with respect to the size house you have. There is little concern with size if you choose to distribute via Cat5 cable.

I speak from personal experience of over 10 years in the satellite business. If you would like more details for have other questions, you can reach me at my email address.