Need help writing content for new website..easy job

I need help writing content for a new website I have. I know what I want to say but need help expressing it in more detail and so it sounds professional. I have about 3-4 pages I need writing for. However I only need about 300 +/- words, a page of writing. I will provide some writing that will need to be finished with more writing. My writing needs to be rewritten so it is organized correctly so once it is finished, readers see that my business is reputable and one they can trust. This writing needs to be done today and is not a hard task since, I am providing some of the writing already. The writing is for my computer business so I prefer to have someone who knows computers so you can use some computer jargon in the writing. Once writing is completed, I will verify to ensure that the writing is not copied from online. If writing is copied from other websites then no payment will be released so please "USE YOUR OWN WORDS"