Du’a is a part of worship and like every other kind of worship, the Prophet (sws) taught us how to perform it with the best of etiquette.
1 – The du’a should be to Allah alone; by obeying Him and not disobeying Him.
2 – When we make du’a we should be sincere in asking Allah, alone.
3 – We should ask of Allah by His most beautiful names.
4 – We should praise Allah as He deserves to be praised before we voice our du’a.
5 – We should send blessings upon the Prophet .
6 – We should face towards the qiblah.
7 – Raising our hands together with palms facing upwards in du’a.
8 – We should have certainty that Allah will respond to our du’a.
9 – We should focus on what we are saying and not be distracted when making du’a.
10 – We should ask frequently and not be impatient for Allah to answer.
11 – We should be firm in our du’a. We should not say please grant me if you so wish.
12 – We should call upon Allah in humility, hope and fear.
13 – Ask in du’a three times.
14 – We should make sure our food and clothing are halal and lawful.
15 – It is good to say du’a quietly and not out loud. Allah is All Hearing so we do not need to shout.
Guidelines adapted by Aliya Vaughan from 'Turning Back to Allah'