Prayer is simple. Prayer is just talking to God. Nothing formal is necessary.
God exists and listens, we just need to talk to Him. Prayer does not need to be formal or in some special place. Prayer is just talking to God in reality. So we don’t need make-up something, just start saying what is on your heart as you talk to God. Prayer is just a dialog between us and God. Prayer can be alone for with others. Prayer can be when we love God and when we hate God. Sometimes we are hurting because of something that happened, so tell that to God. Prayer can be what we feel when we are very encouraged and when we are very depressed and low. Prayer can be when we think we are perfect (only God is perfect), and when we are a sinner (and we all are sinners) and when we feel we are a saint. Prayer can be when we are happy and when we are sad. Sometimes after we pray we feel high and sometimes low.
The Spirit makes it easy, because He knows how and what to pray. Without the Spirit, prayer is hard. With the Spirit prayer us easy. Romans 8:26 And in like manner the Spirit joins also its help to our weakness; for we do not know what we should pray for as is fitting, but the Spirit itself makes intercession with groanings which cannot be uttered.
Look at the prayers of David in the Psalms where David just talks to God. David tells God just what he thinks and how he feels. When David is low, he says “God, I am depressed”.
When David was feeling great, He praises God. Sometimes when he is low is also praises God. Psalms 8:2 Out of the mouth of babes and sucklings hast thou established praise because of thine adversaries, to still the enemy and the avenger.
Also consider some of the points in the article on “What is Prayer”