This is a complex question. It depends on your employment goal and your experience.
Start with some self assessment
*Write a list of all your greatest strengths and talents, things you do well
*Write a list of your jobs and what you did at them
*Write a list of all your accomplishments (ones that an employer may be interested in--note, saving a cat stranded in a tree, while a noble act, doesn't count)
*Write a list of all your hard skills (technical strengths, things you do well )
Now add water, stir...seriously, do a search on resume formats (perhaps looking chronological examples for people the same age, education level and experience as you)
Perhaps take a trip to your local community employment search centre for more assistance. People in those places would be happy to help.