Thundurus is in White only. Tornadus wanders around after talking to a certain NPC, just like thundurus
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Thunderus: by trading, yes. not in the wild. Landorus: bring Tornadus and Thunderus to the Abundant shrine on route 14 to encounter it.
Landorus is found at the back of the abundant shrine, however, it will not appear unless both tornadus and thunderus are in your party.
The legendary Pokemon in Pokemon black is Reshiram and the legendary Pokemon in Pokemon white is Zekrom. There is Tornadus on Pokemon black and Thunderus on white. There is also Landorus which you get from obtaining Tornadus on White along with owning a Thunderus and vice versa for Black. You must visit the Abundant Shrine with Tornadus and Thunderus in your party for Landorus to appear. You can get Virizion from Pinwheel Forest, Cobalion from Mistralton Caves and Terrakion from Victory Road . Victini is available on Liberty Garden if you got the event for the Liberty Ticket. You can get Zoroark from Lostlorn Forest if you have at least one Shiny Raikou, Suicune or Entei. There is Kyruem too, at the Giant Chasm after defeating the Elite Four.
Latios, Latias, Cresselia, Tornadus, Thunderus, Landorus, Heatran
No, Tornadus cannot evolve in Pokémon Black however as of Black 2 and White 2, it is capable of changing forms.