Reformat Excel Sales Data

I have a single Excel file containing 1,500 rows of raw sales data that now needs to become a proper, import-ready database table. Column headers are inconsistent, several cells are merged, and numeric and date formats vary from row to row... (Budget: $250 - $750 SGD, Jobs: Article Writing, Blog Writing, Copywriting, Data Management, Editing, Microsoft, PDF, Proofreading, Word, Writing)