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.
Pickpocket: During your adolescence your family fell on hard times forcing you to turn to petty theft and other criminal activities involving you with criminal organisations.
You become involved with criminal elements of society, taking to a life of crime and earning a notorious reputation and bounty. (work with your DM to determine details)