Yes, you should always use the heavy-weight paper, even for entry-level jobs. 70 lb white or off-white should do. It's not as expensive as you think, maybe $4 for a 30 pack or so. As for listing your strengths, why not list them under the heading "Experience"? Say you were the president of a certain club in your high school or college. You could list this as "Experience leading small focus groups and making decisions based on benefit to composite." Computer skills, such as typing speed (words per minute), software and/or hardware proficiency, and programming languages should be listed under a separate heading, "Technical Skills." Don't worry if you don't have impressive things to say about yourself - a temp job with minimal requirements won't necessitate that.
My resume has my name, address, email, and phone centered at the top, followed by a thick horizontal border and three headings: Education (with a subsection of extracurriculars), Work Experience, and Technical Skills. It's simple, but effective, -- I've received compliments from a few possible employers.
What are you having trouble formatting?