Looking to drive more customers to my website by implementing google shopping

Please can you advise what you would be able to help me with in the lead up to Christmas and generating more sales on my website? I am not familiar with google shopping but think I should be starting sell with it. I have done a little bit of bidding on Adwords but feel I am not knowledgeable enough to be spending my budget correctly. My website is www.headoverheelsgymnastics.co.uk this will show you the products I am selling. They are all related to Gymnastics.
Many thanks, Gemma