Step 1: Forget everything you know about holding your breath
Seriously. If you have never got longer than 1 minute, then you didn't have the proper knowledge to do so. And that's perfectly normal. I was there, too.
My general assumption for most of the people is, that they take a full breath, hold it and then give up after about a minute or so. Then they think it is impossible to do longer. And you are right, it is if you are doing it that way. Just imagine the following scenario: If you want to run a marathon, are you going out there and start running without any kind of preparation or warm up? I don't think so! The same is true for this.
There is no single breath hold technique which really gives you outstanding results
The body is able to store oxygen inside the blood cells. Oxygen is the stuff that keeps you alive and your body is longing for. So if you fill up your storage with enough oxygen before you hold your breath, it is much easier for you, to remain without additional air. It is simple as that