Theorie:

To speak about professions, you need the appropriate vocabulary. Part 1
 
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Actor - someone, especially a man, whose job is to perform in plays and films;

Actress - a woman whose job is to perform in plays and films;

Astronaut - someone who travels into space;

Author - someone who writes a book, article, etc;

Baker - someone who makes and sells bread, cakes, etc;

Barber - someone whose job is to cut men's hair;

Beautician/cosmetician - someone whose job is to improve people's appearance by treatments to their hair, skin, etc;

Biologist - a scientist who studies biology;

Bricklayer - someone whose job is to build houses, walls, etc with bricks;

Bus driver - a driver of a large vehicle that carries passengers by road, usually along a fixed route;

Butcher - someone who prepares and sells meat;

Caretaker - someone whose job is to look after a large building, such as a school;

Carpenter - a person whose job is making and repairing wooden objects;

Chauffeur/driver - someone whose job is to drive a car for someone else;

Chimney sweep/chimney sweeper - someone whose job is to clean inside a chimney, using long brushes;

Draper - someone who, in the past, owned a shop selling cloth, curtains, etc.
 
Examples:

He is a popular author of children's fiction

Can you call at the baker's and get a loaf of bread?

Dad goes to the barber's (= the barber's shop) once a month.