Restarting page numbers and footnotes are two separated tasks.
For the footnotes, it depends on the layout of your document. If your “chapters” are indicated by level 1 paragraph styles (check Tools → Chapter numbering to see which paragraph styles are associated with each level) you just need to go to Tools → Footnotes and Endnotes → Footnotes tab and select the “Per chapter” counting option. Now, if your chapters are not at level one (for example, your book is divided on “Parts”) then you’ll need to work a bit more: put the content of each chapter in a different “section” by selecting the content and going to Insert → Section → Footnotes/Endnotes tab → check the option to gather the notes “at the end of the text” → check the option to restart the numbering.
To restart page numbers insert a page break by going to Insert → More Breaks → Manual Break → pick a page style (it can be the same page style in use) → check the option to change the page number and select the number. If the page break is already there, go to the first paragraph after the break → right click → Paragraph → Paragraph → Text Flow tab → Select Insert under Breaks → With page style (pick one) → page number → select your number.
You’ll find more information in the help and, ejem, in my free book about Writer 
