Keep rolling! You can see there are gaps at this stage.
Polymer clay will keep for ages, providing it is kept in a plastic (Grade 5) box. Some other grades of plastic will be melted by the clay. Just check there is a number 5 in the triangle underneath the box and it'll be fine. Canes that have been made previously can also be stored and used in other projects - you can see some of mine above. Scrap clay is kept to be used in other designs or as the bases of other beads - there is very little waste. If this post has whetted your appetite for more, do go and have an internet search for polymer clay artists, as there are some amazing makers out there. I love using polymer clay as it is very forgiving and can be used in so many different ways - the only limit seems to be the maker's imagination!