Introduce the characters in your stories by name the first time you bring the character into the story. Describe the characters as you see them. For example, describe their hair color, build, height.
Describe their thoughts in third person using their names. For example, "Alex thought the man was too thin."
Write from the point of view of each character in the story not just the main character. Include character names, descriptions and dialog.
Let everyone speak and tell the story from their own point of view. Use dialog from each person. Use "he said" or "she said" when writing the dialog. Pretend you are telling someone else about each character so that it remains in third person.
Use the pronouns "he" and "she" in place of the names, not "I" or "you."
Read magazines and newspapers for examples of third person. Many novels are written this way.
Stay in the third person point of view. You don't to confuse readers by shifting to "I" or "We." Write what you see as an observer or what the character sees.