Short answers, pulled from the story.
French scholar Joseph de Guignes became the first person to propose a link between the Huns and the Xiongnu people in the 18th century. This connection remains one of history's most debated questions nearly two hundred years later.
By 370 AD, the Huns had arrived on the Volga River causing the westward movement of Goths and Alans. This migration triggered a chain reaction across Eastern Europe as several central and eastern European peoples established kingdoms under Hunnic hegemony or fleeing from it.
Bleda died in 445 and Attila became the sole ruler of the Huns. In 447, Attila invaded the Balkans and Thrace ending in 449 with an agreement where East Romans paid him an annual tribute of 2100 pounds of gold.
Ancient descriptions stress their strange appearance by caricaturing them as monsters with short stature, tanned skin, small eyes, and flat noses. Archaeological finds suggest they were a racially mixed group containing only some individuals with East Asian features while genetic data shows genomes varied from European to Northeast Asian connections.
The Huns practiced pastoral nomadism living off herding and moving from pasture to pasture to graze their animals. They certainly ate horse meat drank mare's milk and likely made cheese and kumis while spending great deal of time riding horses.