If you have satelite service at home, most seem to go with the same vendor. If not, DISH has a Pay-as-you-go monthly plan that I'm using. If you don't make the payment by the due date, service is shut off. You can restart it just by calling (or online) and making the CC payment to continue. The cost is dependent on the viewing plan you select.
I bought the DISH ViP211k receiver, Winegard GM1518 automatic carryout antenna, tripod, ladder mount, and a 12V transformer for it (the automatic antenna) from Camping World. The set up works fine at home on my south facing driveway where there are no trees, but I had major problems getting a signal at the CG due to the abundance of tall trees. I'll be giving it another try this coming week at the CG now that I finally have a smart phone and downloaded the DishPointer Pro app to see if I can find a hole in the canopy.
Where to mount the receiver is dependent on where you can put it to plug it into 120V, the TV, and the antenna feed. Where you place the antenna is VERY dependent on getting a clear spot through the trees/buildings/other RV's, and anything else that might block the signal. Many use the standard tripods with the "normal" looking dishes, others on seasonal sites actually mount them to the trees. Depends on how deep your pocket is and how much you want to fiddle with the antenna.