This looks awesome. I am looking at buying a raised garden bed and wondered how much soil I need to buy for one about 100cm x 100cm x 30cm. Also, I am not a gardener so what soil do I buy, topsoil, compost, etc or a mixture and if a mixture what do I put in first and what on top, etc
Welcome to Workshop. This is a popular topic at the moment.
You should find everything you need in these recent discussions which have covered the topic of how to fill a large raised garden bed:
After you have a good read I would encourage you to hit the Start a discussion button and ask any questions you might still have in a new topic so that members will be able to find your post more easily.