How to learn about table structure?

At my current job i track my own hours, as well as product taken at cost (itโ€™s a food producing business) and expenses carried on behalf of my employer, so i can calculate a total owed to me at the end of the week.
Iโ€™ve been looking at timesheet app examples but canโ€™t seem to find anything quite right even for just my own hour logging, let alone the other two requirements.

Some advice on a spreadsheet layout would be appreciated or even a point toward reading material on table layout, etcโ€ฆ

Thank you

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Steve
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Platinum 4
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