Work out what you actually need first
Before you write a job advert, get specific about the gap you’re filling. Is it extra hands on a till, someone to pack and post orders, a person to answer customer queries, or cover for existing staff taking well-earned time off around the holidays? The clearer you are on the exact tasks and hours, the easier it becomes to write an advert that attracts the right people rather than a general pool of applicants who may not suit the role.
It’s also worth working backwards from your busiest dates. Map out when demand will peak and build your staffing plan around those weeks, including a bit of overlap for training before the rush properly begins.