I've told this story before here, but the first time I had sex, my boyfriend asked me for a bl** ***(what we called it then)....I was 21 and a virgin, so I just gave it the old college try....when I hear, " It's not a corncob!"...and laughter. I laughed, too!! So, I agree that you need some direction before you begin.
So, start out sucking and tonguing the end of his penis....and ask for directions from there. Trial and error, practice, practice practice....just like everything in life.
By the way, you better be in your twenties!!