There are a variety of formats to choose from. The format you choose will depend upon what part of your experience you want to emphasize. Job titles and places of employment are highlighted. This format highlights the areas of specific strength or skill that relate to career or job objectives. Job titles and places of employment are de-emphasized.
Paragraphs are fine.
Dates may be placed at the ends of lines, in the margins, etc. Whatever appeals to you, as long as your resume is easy to read. Consistency is important. If your dates are in the margin next to one heading, don't make them at the end of the paragraph for the next, and so forth. Again, make your resume easy to read.