There's a ton of sites out there with resume writing help, I'd try a search.
Simple tips....use "power language" to get the point across in fewer words. Stick to highlights and don't go deep into details. The resume is basically a tiny abstract of your skills, you don't want it to tell all the details. If they're interested in an aspect, they'll ask, and that's where you get the chance to providde the juice (in an interview, of course).
Stick with similar word choices. A bad example:
* Worked with xyz software
* Have experience with yadda yadda yadda
Better example:
* Worked with xyz software
* Experienced with yadda yadda yadda
Slight difference, but it reads more easily when all the bullets in a section start similarly using the same type of word and the same tense, etc.....so it's not the best example, and there's better ways of saying it than I did anyways, but you get the point.
Keep it neat. No spelling mistakes. There isn't a need to complete sentences. Keep it to 1 page.
Maybe think about writing a cover letter.
There's so much more....but it's covered all over the net and elsewhere.
b