Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh

Salat Al-Hajah is any normal two Rak’at that you make Wudu first then pray and read quran to your choice after Al-Fatihah.

After you are done from Salah, you say this supplication:

There is no god but Allah the Clement and Wise.
There is no god but Allah the High and Mighty.
Glory be to Allah, Lord of the Tremendous Throne.
All praise is to Allah, Lord of the worlds.
I ask you (O Allah) everything that leads to your mercy, and your tremendous forgiveness, enrichment in all good, and freedom from all sin.
Do not leave a sin of mine (O Allah), except that you forgive it, nor any concern except that you create for it an opening, nor any need in which there is your good pleasure except that you fulfill it, O Most Merciful!”Then you say the specific Dua you intend for…

If you do not know the Arabic Dua, you can write it on a paper and read it or even just limit your Dua to that which you want specifically.

Almighty Allah knows best.