Hi Ramon; There is no exact prayer that you should say but you should speak to God as you would speaking to a good parent or grandparent. Jesus did give us an example of what to do and what not to do; but remember this is a general example. Here is what the Bible has to say when Jesus was asked this question.
Mat 6:5
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And when thou prayest, thou shalt not be as the hypocrites [are]: for they love to pray standing in the synagogues and in the corners of the streets, that they may be seen of men. Verily I say unto you, They have their reward.






Mat 6:6
But thou, when thou prayest, enter into thy closet, and when thou hast shut thy door, pray to thy Father which is in secret; and thy Father which seeth in secret shall reward thee openly.






Mat 6:7
But when ye pray, use not vain repetitions, as the heathen [do]: for they think that they shall be heard for their much speaking.






Mat 6:8
Be not ye therefore like unto them: for your Father knoweth what things ye have need of, before ye ask him.






Mat 6:9
After this manner therefore pray ye: Our Father which art in heaven, Hallowed be thy name.






Mat 6:10
Thy kingdom come. Thy will be done in earth, as [it is] in heaven.






Mat 6:11
Give us this day our daily bread.






Mat 6:12
And forgive us our debts, as we forgive our debtors.






Mat 6:13
And lead us not into temptation, but deliver us from evil: For thine is the kingdom, and the power, and the glory, for ever. Amen.
Again this is a general example or guideline.
So God Bless You! Ramon