Sourdough starter

I have made sourdough bread before but it didn't turn out as good as I expected. After all I don't think sourdough breads are really my thing.
A few weeks ago bought some sourdough bagels from Wild Wheat and found that their sourdough bagels are pretty nice. So I decided to give it another go.

This time start out with 25g wholemeal flour and 25g water.

After 24 hours and there isn't much activity with my starter. I think the room temperature is too low. I have to give it another day.