Answer by taking a quote from the following article:

Jeb Bush was born on February 11, 1953 in Midland, Texas. When he was six years old, the family relocated to the Tanglewood neighborhood of Houston, Texas. The nickname "Jeb" is composed of his initials J.E.B. (John Ellis Bush). He grew up with two younger brothers, Neil and Marvin, one younger sister, Dorothy, and one older brother, George, who is seven years older.

In 1974, Bush went to work in an entry-level position in the international division of Texas Commerce Bank, which was founded by the family of James Baker. In November 1977, he was sent to Caracas, the capital of Venezuela, to open a new operation for the bank, where he served as branch manager and vice president. Following the 1980 presidential election, Bush and his family moved to Miami-Dade County, Florida. He took a job in real estate with Armando Codina, a 32-year-old Cuban immigrant and self-made millionaire. Codina had made a fortune in a computer business, and then formed a new company, The Codina Group, to pursue opportunities in real estate. During his time with the company, Bush focused on finding tenants for commercial developments. Codina eventually made Bush his partner in a new development business, which quickly became one of South Florida's leading real estate development firms. As a partner, Bush received 40% of the firm's profits. In 1983, Bush said of his move from Houston to Miami: "On the personal side, my mother-in-law and sister-in-law were already living here", and on the professional side, "I want to be very wealthy, and I'll be glad to tell you when I've accomplished that goal." During Bush's years in Miami, he was involved in many different entrepreneurial pursuits, including working for a mobile phone company, serving on the board of a Norwegian-owned company that sold fire equipment to the Trans-Alaska Pipeline System, becoming a minority owner of the Jacksonville Jaguars, buying a shoe company that sold footwear in Panama, and getting involved in a project selling water pumps in Nigeria. Miguel Recarey, who ran International Medical Centres (IMC), employed Bush as a real estate consultant and paid him a US$75,000 fee for finding the company a new location, although the move never took place. Bush did, however, lobby the Reagan administration vigorously and successfully on behalf of Recarey and IMC.

Where did Bush start his business career?
Texas Commerce Bank,