Utter insanity.
You're eighteen, you have no relevant education, work experience or life experience in general. You know barely anything about the world and you're living in this sheltered environment where someone is always taking care of your as if you were a child. You're eighteen years old, you've barely been born for most intensive purposes and you're considering marrying a man you've never met who is considerably older then you? This is backwardness of the Islam on a really daily basis. Have you ever considered simple incompatibility? That two people simply might not be right for each other? To think that someone needs to be an educated Muslim to be everything you want is a horrible call on your part and it might cause you a lot of pain, suffering and desperation later. What if one day he starts to beat you? Verses in the Quran clearly support it. Since you don't know him personally and you know basically nothing RELEVANT about him, he can turn out to be horrible quite easily.
Neither Islam nor his education will make you fulfilled in life. For the sake of all the reason in the world, run away from that with haste. Meet someone healthily, get to know them, develop a friendship, grow to like one another, have experiences together and then, if you like him and him you, and if you're compatible, consider marriage and deeper connection.