If you're trying to make money online and you aren't a good writer, you need to hire one immediately. 

Words are king online - the search engines index them, they convince people to spend their hard earned money on your products, and the more you write the more you'll earn.  You should be writing every day - articles, reports, blog entries, website content, ebooks, and press releases.  Even if you feel like you're not the world's best writer, you need to brush those feelings aside and just keep producing content.

To improve your writing, save every piece of good writing you come across, especially online.  Save every well-written promotional email, every good sales letter, every good order page, and every good press release you see.  You need to change your mindset to learn to love advertising instead of hate it.  Look at quality written ads as a way to increase your income, not as just another annoyance.