I suggest you start with HeadSpace, it's an app with zero spirituality or religion, and IMO killer content (if I'm not mistaken, the voice of the videos is that of the founder himself, who used to be a monk). Most of the content you have to pay for, but it provides the first 10 lessons (for the first 10 days, although you can replay them as much as you want) for free, and I think they're a fantastic, easy way to get started.