Set up whatever headings are appropriate for you. Here is a basic style. Vary centering or not, bold and italicize job titles, bold the headings, leave a good amount of white space --

Skills

> Offer professional-quality administrative assistant skills and excellent work ethic
> Am proficient, loyal, thorough
> Possess effective interpersonal and communication skills
> Quickly comprehend new methods and procedures
> Work well independently, and effectively within team environments
> Possess very strong problem-solving skills
> Have basic computer knowledge

Title, Company, Location, Dates

E.g. --
Archivist, XYZ United, Plano, TX (02/06-06/09)
> Organized and filed photos
> Carefully separated photo batches
> Assigned locations for filing

Volunteer Experience

Volunteer position, Organization, Location, Dates
> Duties

E.g. --
Volunteer e-mailer, CatsPlus, Lima, Ohio (02/02-Present),
> Submitted grants to non-profit organizations for Haiti relief
> Kept charity organization in contact with supporters