Start small. 5 minutes, twice a day, morning and night, is more than enough in the beginning. When I started meditation, I found it useful to tie it into everyday tasks. I put little coloured stickers on the back of my phone, the tv remote, or on the fridge for example. Every time I noticed them or came across them, I would pause, notice my breath, my thoughts, and my mood, and then further spend a couple of minutes just noticing my breath.
Simple right? just start small. Simply noticing what's going on with your breath, your mind, and your body and mood.
Pranayama can be just as effective, if not more effective than a seated concentration style meditation practice. When we manipulate the breath and lengthen the inhales and exhales, we in turn manipulate the mind. As the breath slows, as does the thoughts in the mind.
A slower breathing pattern in turn signals our nervous system to relax, and brings us deeper into a parasympathetic state, meaning we feel more relaxed, and safe.
So if you're really not getting on well with concentration practices of meditation, give pranayama a try, and treat it with the same respect of practice. Use it to be your focus, and let it slow you down.