Your people are nomads and rely heavily on livestock that can be moved as seasons and resources dictate. Most nomads use mounted or use beasts of burden to transport belongings. Nomads organise along family group lines and families stick together.
Poor: very low income. compared to many. He usually does not or cannot own property. His home is usually of lesser quality, sometimes due to uncaring landlords who may also be the Poor person's employer.
Martial training: In adolescence you trained with the weapons of your people and learnt how to use them proficiently (work with your DM to determine details)
When you become an adult you learn to used a weapon (of your choice) appropriate for your culture and social standing. (work with your DM to determine details)