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The most important thing to consider to ensure that your work gets published and bought is to have it thoroughly proofread, revised (where necessary) and reviewed (by professional/respectable critiques).
There are a couple of thinhs that are a must-do before approaching a publisher (it is dependant on what you write). Self-confidence, absolute familiarity with the craft and its market,,,,,,,,,,,,,,,,,,and a good agent!
