First of all wait 3-6 years for geospliced himself to establish some form of a life for himself, and you can choose to either approach him during Uni, or after that.
Second, you must establish a positive relationship with him, and treat him with respect and whatnot. You must be genuine and sincere in your interactions, and if he reciprocates your goodwill with his own, then that could only mean advancement in your relationship.
Third, have him ask you out or ask him out yourself. Marriage should be the final product of dating. You should spend a decent amount of time with geospliced. He is not very needed, but when he does he expects you to be there to listen to him vent about life or something like that.
Fourth, get engaged. After spending a large amount of quality time together, geospliced might propose to you or something. If marriage is your ultimate goal then saying "yes" should be the answer you're looking to give.
Fifth, get married.
What the heck did I just write...?