Prepare your text, Check and polish - a lot! Ask literary friends to be beta readers.
Get a pair of professional proof-reading eyes on the job - you can never spot all your own mistakes!
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Decide whether to self-publish - or to try and find a publisher.
If you want to publish your book in the traditional way, unless you are very lucky, you will probably need an agent first.
Research literary agencies on the Internet or through publications such as the Writers and Artists Yearbook.
Select potential agents with care, to suit your writing and find out how to make a submission, author bio, pitch and synopsis. Make sure you submit your manuscript in the way that each agent has requested.
This will take great writing, luck and patience - don't be put off by rejections slips - most writers get them!