I make sure the room is quiet and I can't hear any noises from outside. That helps me focus.
Guided visualization is wonderful if you are stuck or for falling asleep or releasing stress. I hope this helps. Start with trying to focus for one minute. This may take some time. Just enjoy. There is nothing you have to do and no right or wrong. Just intend to focus and bring the mind back when you forget.
After it gives you a good baseline of meditation 101, it teaches you more advanced techniques. Once you feel comfortable doing it on your own, I find it helpful to employ those techniques with some sort of rythmic sound. Fire crackling, wind howling, etc.
Hope this helps!