Salam Brother, i included a few supplications, but reciting these supplications on their own is not sufficient you should after every prayer thank Allah and pray for him. You can always ask for something after you finish prayers, i personally usually do my thanks and extra prayers after Isha'a prayer. Hope this was of help.
This du-a'a known as "supplication of the youth stricken for his sin," is quoted from the work of Kaf-ami and from Muhaj al Da-wat by Sayyid ibn Tawus. Through Imam Hussain(as) it is reported that one day he and his father, after performing Hajj, caught sight of a paralysed young man crying his eyes out in repentance. They went near to console him and find out the reason of his sorry plight. He was a habitual sinner, always teased his father, disobeyed him and treated him with contempt. One day, disgusted, the father invoked curse upon him. So he was affected with paralysis. Then and there Imam Ali ibn abi Talib(as) wrote his dua'a and gave it to him with instruction to recite after Isha salat. Next day fully cured, he came to Imam Ali and said that he had recited the dua'a as told and went to sleep. He saw the Holy Prophet (sa) in the dream. The holy prophet, gently touched his body with his hand and asked him to remember this dua'a as it contain ismi azam (the great name of Allah).
Recite this dua'a after Isha salat. It brings countless blessings. All your legitimate desires will be fulfilled. It drives away poverty and sickness. Sins are for given. Debts are cleared. Enemies become friends. Domestic affairs are set aright. Disputes are settled in your favour. Prisoners are set free mental worries disappear. Prosperity, sound mind and healthy body stand by you at all times.
Mercy and forgiveness of sins are the main advantages the almighty Allah makes available if this dua'a is recited regularly.
Ibna tawus in his book Muhaj al Dawat and Kafami in his book Misbah narrate this dua'a on the authority of Imam Ali ibna abi Talib who learned it from the Holy Prophet. The Holy Prophet advised him to recite this dua'a regularly, whether in prosperity or poverty, till death, because it unveils the secretes of creation and divine strategy. Words can not describe its merits. Intelligent can not describe its meanings. No sooner someone begins to recite it, Almighty Allah send blessings, and his mercy surrounds him, peace and tranquillity descend upon him. The sound of this dua'a moves to and from around the arsh, its direct destination. All his desired are fulfilled. His needs are taken care of. He gets freedom from wants and is kept safe from hardships and misfortunes. His mind opens up new dimensions of contemplation. On the day of judgement he will be received by Allah with respect and honour.
It cures insanity if recited before a mad man. It relives pain of childbirth if recited before the expectant mother.
It recited on forty Fridays consecutively all sins are forgiven. It cures sickness and disperses sorrows. For him who recites it before going to sleep Allah appoints one thousand angels to pray for him till morning. He who recites it and dies within 24 hours it treated like a martyr. It is recommended that it be performed with ablution.
According to Allama Majlisi (on whom be Allah's Mercy) Kumayl had attended an assembly in the Mosque at Basra which was addressed by Imam Ali in the course of which the night of the 15th of Shaban was mentioned. Imam Ali said-"Whosoever keeps awake in devoutness on this night and recites the Du'a of Prophet Khizr, undoubtedly that person's supplication will be responded to and granted. When the assembly at the Mosque had dispersed, Kumayl called at the house where Imam Ali was staying, and requested him to acquaint him with Prophet Khizr's "Du'a". Imam Ali asked Kumayl to sit down, record and memorise the "Du'a" which Imam Ali dictated to Kumayl.
Imam Ali then advised Kumayl to recite this "Du'a" on the eve of (i.e. evening preceding) every Friday, or once a month or at least once in every year so that, added Imam Ali, "Allah may protect thee from the evils of the enemies and the plots contrived by impostors. O' Kumayl! in consideration of thy companionship and understanding, I grant thee this honour of entrusting this "Du'a" to thee."
Dua'a E Tawassul
Shaykh Tusi says, in his book Misbah, that Iam Hassan bin Ali Al Askari (as)wrote this dua'a for Abu Muhammad who requested him to teach him the proper way of reciting salawat. Allama Majlisi has mentioned this dua'a on the authority of Ibn babawayh who confidently says that there is no difficulty or problem that this dua'a does not solve.
The merciful Allah is beseeched in the name of and for the sake of the Holy prophet and his Ahl ul Bayt. who are amongst the best human beings in status with HIM . It is also known as "quick-fulfillment-of-all-legitimate-desires" dua'a.