What type Mortor should I use?
No Mortar for the pavers, you'd lay the pavers on a 1/2" to 1" bed of sand &amp; sweep either that same sand or the below special Perma-Sand into the paver joints. This, allows for the constant movement &amp; drainage. Mortared or not you'll need a perimeter retainer of, at least, 1/2" tall.

If you insist on Mortaring the pavers, &amp; having cracks, then use a Type-S Mortar, this would also be used for the Fire Pit's red or decorative brick. The Fire Pit needs a Fire Brick interior Mortared with High Heat Cement.