I need some guidelines on how to calculate for PAYE.
There is a website where authors provide all the necessary details on how to calculate the PAYE taxes and their references. I strongly recommend you read through the text on that page to learn how to properly use the calculator.
Paye example site: http://www.revenue.ie/en/business/paye/guide/employers-guide-paye-calculation.html
Also, you can use Google to check other websites that provide additional information about it. Here is the short link for the mentioned Google Search: https://goo.gl/K5XZte