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Make your sales forecast based on your previous achievements, expected market development, your current resources (sales team, sales tools, marketing campaigns, ....).
Then you should match your sales forecast with the annual business plan. If it fulfills the business plan needs, that's fine, if not, see if the shortage with reference to the business plan is reasonable or not and what will you need to do to get more sales to meet business plan's needs. This may be by hiring new staff, introducing addition sales campaigns, improving staff skills, ....
