I do not find any evidence in the sources to conclude that Allah gives anyone the ability to control jinn and make them serve them. We know for sure that Allah granted prophet Sulayman control over jinn, the birds and certain other forces of nature such as winds. The Quran does say that some people do seek the help of jin and evil spirits; and that some people may be possessed by the devil or evil spirits. However, the Qur'an categorically states that the devils cannot exercise permanent control over Allah's faithful servants who submit to His will. We are, therefore, told to seek refuge in Allah from the evil spirits and the devils that whisper and influence people.
So, as a believer who is diligent in observing the commandments of Allah and is practising daily adhkar and duas you need not worry about the work of such people. Nor is it recommended for you to seek help from them. You can empower yourself by following the spiritual regimen prescribed by the Prophet (peace be upon him) which is sufficient to protect us against all evil influences. You are advised to get a copy of Invocation of God by Ibn al-Qayyim al-Jawziyya. You should study it and practice its lessons every day.
As for your second question, I wish to state the following: If you wish to pray to Allah for a specific purpose you should do so by offering the two rakahs of salatul hajah and offer the following supplication.
"La ilaha illallahul haleemul karee; Subhanallaahi rabbil 'arshil azheem; al-hamdulillaahi rabbil 'aalameen, as'aluka Mookibaati rahmatika wa 'azaa'ima maghfiratika wal ghaneemata min kulli birrin, wa ssalaamata min kulli ithmin, laa tada' lee dhanban Illaa ghafartahu walaa hamman illaa farrajtahu, walaa haajatan hiya laka ridhan illaa qadhaytahaa yaa arhama al-rrahimeen.
"There 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 forgiveness, and all that is good, and freedom from all that is sinful. Do not leave for me an sin without forgiveness, and no worry of mine without removing it, and no legitimate need of mine, which conforms to your goodly pleasure without fulfilling it, O the Most Merciful!"
You can then use your own words in your language. The fact that you are feeling that the answer is coming is an auspicious thing. The Prophet (peace be upon him) advised us to pray to Allah while we are certain to receive an answer; he further told us to pray unceasingly.
Furthermore, he also said, "prayer is always beneficial as Allah gives what we ask for immediately, if He determines it is beneficial for us; otherwise, by virtue our prayer He averts from us a certain calamity that was decreed, or He simply keeps it as a treasure to reward us with it on the day of judgment."
So, I would urge you to continue to offer prayers, trusting and accepting Allah's choice for you.