You could also consider standardizing the look of your existing fencing. There's a dark section of fencing to the right, you could match the rest of your fencing to this by first applying an anti-algal solution and then staining the fence to match. It will make the garden feel planned rather than fixed!
Fix any boundary issues first - it looks like you could do with installing extra gravel boards which will mean taking out & replacing the panels but will hold back next doors soil. Replace any worn panels or posts. When its dry, paint or stain the existing panels - replacing them when you garden is more established may be tricky. If its in your budget use a fencing contractor when you need to - its quite hard work otherwise. As for the the garden itself - don't worry about for now - there isn't really much you can in anycase. I doubt we've seen the worst of winter so you'd just be working in sticky mud..and the cold! See where the water flows and if it drains. It will be a good starting point to how you design the garden when it warms up. Also decide over winter how you want to use the garden..do you want a pergola say?
We used good quality sleepers to hold up a bank in a similar situation. The builder laid them on their edges two rows high, and then drilled and hammered in steel reinforcing rods right through them at least 18'" into the ground below them ... I think it was two or three rods per sleeper length. They were then backed with damp-proof-course type material, and back-filled with good quality screened topsoil. That''s ten years ago and they've been fine ever since.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
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As for the the garden itself - don't worry about for now - there isn't really much you can in anycase. I doubt we've seen the worst of winter so you'd just be working in sticky mud..and the cold! See where the water flows and if it drains. It will be a good starting point to how you design the garden when it warms up. Also decide over winter how you want to use the garden..do you want a pergola say?
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.