In order to receive internationals you will need the dishes stated above. All internationals are at the 118 orbital location. But the really special piece of equipment you need is Dish's dual band LNBF that receives both 119 and 118 in a single LNBF: one LNBF for both 119 and 118 satellites. Also, the dish must be larger than the Dish 500 because 118 is an FSS Ku band satellite that operates at lower power than DBS satellites, and the larger dish is needed to receive sufficient signal strength form the lower powered 118 satellite.
Now, one can DYI this using some non-dish equipment and multiple dishes, but you really have to know what you are doing. It seems to me the best course for you is to let Dish do this for you, but it may require a cost to upgrade but almost certainly a commitment with possible no cost.
Or You can purchase all the Dish parts you need form on-line stores or as a kit, everything you need and guaranteed to work and is compatible and install the Dish 500+ ( or 1000+ if you receive HD channels) along with the appropriate LNBF's yourself. The Dish 500+ (and 1000+) dish itself is manufactured at the larger size that you will need to receive the lower power FSS Ku at 118 that has the internationals.
Good Luck.