Posted: 26/09/2016 at 17:02
A general mix of soil and compost will be suitable for most things. You can add extra nutrition to the mix as and when you need, and depending on what you eventually grow. I wouldn't add the shavings.
More important is how much light and shade the bed has, and most important of all, what do you like to eat? Not much point in growing fabulous beans, for example, if no one likes them
Looks like there's quite a bit of shelter form a building too - you'll have to make sure you water well enough too, if the bed won't get a lot of direct rainfall. Some crops will need rotaion too, to prevent a build up of pests and diseases.
2.4m x 1.2 m might seem quite a lot of room, but it isn't really. You might need another one