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Ghenwa Khayat , Accredited Member/Examiner , Arab Professional Translators Society
There are plenty of tips, check the websites below, it will help for sure! :)
http://writetodone.com/2012/02/09/eight-simple-tips-for-editing-your-own-work/
http://www.thedailymuse.com/career/5-steps-for-editing-your-own-writing/
Good luck!
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Karen Simon , Freelance Writer & Editor , Self Employed
Always reread your work multiple times. Even when you think your writing is done, take a break from it (for an entire day if deadlines allow), reread it again and edit further. Write less, not more -- think succinct, short sentences. Flowery words do not convey messages better; they weaken your writing. Always use the active voice, rather than the passive.
If you only ever read one book about how to improve your writing style, read The Elements of Style (http://www.crockford.com/wrrrld/style.html)