Yes, your shed does need a base. This is to give it a solid, level foundation. Open soil will not help with the longevity of the shed itself or the contents within. The best materials to use to make your shed base are concrete, natural stone or wood.
Weymouth
The beachfront town of Weymouth is located in Dorset and has a populace of close to 53,000. It's located within England's South West having a selection of Georgian buildings and post-war homes. Weymouth includes a populace density of 2,800 people for every kilometre squared, with home prices particularly high in comparison to the UK average. To make sure of keeping this high value, work with reliable tradespeople for the home improvements and do a comparison of quotes to get the best price.