Need a Marketing Guru! Facebook, instagram Google Ad Words

I am looking for someone to run and tweak our marketing, and anything else you might think you can offer, we only use Google Ads at the moment, but want to introduce Facebook and Instagram or any other channel you might think would help generate sales, we are an ecommerce store and require as many conversions as possible.

At the moment we want to spend a small budget of around £300 a week on all channels and add more money into which ever seems to work the most, so i am open to any suggestions you might have.