A couple of my favourite scriptures to pray are from Psalms 91 (for protection) and Psalms 103 which reminds me that my Heavenly Papa forgives me of ALL my iniquities and heals ALL my diseases. Try personalizing scripture with your name and reading it out loud. Moses had an intimate walk with The Father and he didn't hesitate in using God's own word in prayer when he interceded for the Israelites and for his sister Miriam.
Then the people cried out to Moses, and when Moses prayed to the Lord, the fire was quenched.
Therefore the people came to Moses, and said, “We have sinned, for we have spoken against the Lord and against you; pray to the Lord that He take away the serpents from us.” So Moses prayed for the people.
So Moses cried out to the Lord, saying, “Please heal her, O God, I pray!” (even after Miriam spoke against him)
Exodus 32:(11-13) Moses intercedes for Israel.
Then Moses pleaded with the Lord his God, and said: “Lord, why does Your wrath burn hot against Your people whom You have brought out of the land of Egypt with great power and with a mighty hand? Why should the Egyptians speak, and say, ‘He brought them out to harm them, to kill them in the mountains, and to consume them from the face of the earth’? Turn from Your fierce wrath, and relent from this harm to Your people. Remember Abraham, Isaac, and Israel, Your servants, to whom You swore by Your own self, and said to them, ‘I will multiply your descendants as the stars of heaven; and all this land that I have spoken of I give to your descendants, and they shall inherit it forever.’”
He reminded God of his promise and instead of taking God up on starting a new nation with Moses, Moses entered into God's heart for the people and stood in the gap for them and God heard.
Are there any of God's promises that you like to use in prayer? They are straight from His heart so get into the word and start asking!