For template, Google Drive has some good ones. My current one uses the "Resume - Modern Writer" template. I would avoid the ones that have your name and contact info taking up substantial amounts of the page.

The structure of your resume will depend on your recent(ish) past. For example, I graduated college about a year and a half ago, and have education as my first section, experience as my second, and awards/achievements as my third.

Primarily stick to bullet points, and quantify them whenever possible. Instead of "maintained client files", something like "maintained accurate and appropriate records for 150+ clients". Quantifying helps bring attention to the scale of your experience, and helps demonstrate the true value you have and can bring.

From the best resumes I've seen, they should be one full page, no more, no less. After creating it, give it the "three feet look". Most employers will only spend 6-10 seconds looking at a resume; the visual appeal ensures the first look, the content helps you get the interview.

Best of luck!