Hopefully your question is but a question only. I would suggest that in your interview with him he will ask you to renounce Christ as the son of God. That all teaching about Christ will become null and void. He will then TELL YOU to make a binding covenant with him to obey him only in all that he TELLS you to do. He will more than likely TELL you to reject your family as he will be your father and mother from now on. But one must understand that you cannot make any deals with the Devil, you are his servant, he is the master. If you get into trouble he will neglect to help you in any way, but cast you aside as dross.
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Most people believe there is a way to out fox supernatural beings. This position is supported by stories like "The Devil and Daniel Webster" which indicate that a good lawyer can beat the devil. "The Devil Went Down to Georgia" is an example of a country bumpkin beating the devil in a fiddling contest. Christian believe that even their god can be tricked into changing his mind (the story of Abraham saving Sodom inGenesis 18:16-33 is an example).During the Middle Ages the devil was generally portrayed as a evil but feeble minded sort, easily duped out o "his due" by wise peasants and canny grannies.
The devil does not really exist, so in reality you can never make a deal with him. Satan entered post-Exilic Judaism as the 'adversary' but under the instructions of God, tasked to test the righteousness of the faithful. In the Persian religion, Zoroastrianism, Angra Mainyu is the wholly malign adversary of the Persian god, Ahura Mazda. When this concept was adopted in Judaism after the Babylonian Exile, the Jews struggled with the notion of God having an opponent who could defy him. Deciding that this was not possible, the Jews adapted Satan to do God's bidding by challenging the faithful, as we see in the Book of Job.
In Christianity and then Islam, Satan evolved to become the evil opponent of God, seeking to cause the faithful to deviate from righteousness and to destroy God's kingdom. Presumably if you make contact with the devil you will be enticed to do his bidding, which is supposed to be to do evil, thereby consigning you to hell in the afterlife. But if you did not read about Satan in books you believe to be true you would have no reason to think that he exists. After all, why should we believe a being exists if we can not even decide whether he helps God or opposes him? No wonder medieval folk lore was able to insist that he could be tricked out of his side of the bargain.