Thanks for all your help John. I was able to sync it yesterday. Since it was podcasts that I was trying to sync, I didn't realise that each was about an hour long and it exceeded the available storage space I allotted it. In the end it all worked out just fine, I just used fewer. The watch together with the beats headphones was absolutely wonderful for my workout! It worked like charm.:-)
I love my watch now! Cannot believe I lived without it before. No more near misses with iPhone falling out of my back pocket or fidgeting with the earphones cables while running.
It is a pity the watch was not fully charged as I bought it, because then I could have been helped in the apple shop already. But I was in the rush to go home, so a bit my fault too.
Thanks for making it clear that not all apps are compatible with the watch. I understand it now and I hope many will become so in the near future.