You have never sucked cock in your life but you're going to for me and your own very good, you need to learn it by practicing and obviously it won't be quick. You may have gotten a bj or two in your life but it's very different to be the one giving it, especially for a dummy like you, all you need to know is the basics and to train your mouth, you gotta know how to lick it, to stroke it, to take breaks because your untrained jaw will get tired, how to place your tongue... so many details go into sucking dick, so listen carefully, you will need all the info before a cock fucks all the brains out of you so you'd at least have this in mind.