Answers to your Questions:

How should Paving flags be laid?

Typically Natural Stone Paving and Wet Cast Paving should be laid with mortar bed and joints should be with a solid grout. eg FUGE 
Hydraulically pressed concrete flags can be laid on a flexibly sand bed with sand joints.

How should paving brick be laid?

Answer to question 1

How much decorative stone will i  NEED?

Answer to question 2

what dept of paving brick do i need?

 Paving blocks are available in 3 depths - 50mm, 60mm & 80mm

• 50mm - suitable for paths, patios and light vehicular traffic - average use on a domestic driveway.
• 60mm - suitable for any busy driveway
• 80mm - suitable for commercial, high volume traffic. ​

Question 4

Question 5

i can not find an answer to my question

hardscapes@eircom.net - questions answered on the same day.