Skipping the cover and starting from a specific number
In a report or proposal, the cover is usually not numbered. Choose Skip the first page so the second page becomes number 1. If this PDF continues another document, change Start at number, for example to 15, so the numbering carries on.
The number goes up by 1 for each numbered page. In formats that include a total, such as 3 of 10, the total follows the last number printed.