We bought an overgrown, derelict property 2 yrs ago. Other than 1 tree, there was nothing in the garden. This is the 1st summer I've had some raised veg beds, but still have the rest of the garden to do. Gardeners world have a free forum where you can ask questions, send in pics for advice, looks at other plans/ideas etc. Recent discussions — BBC Gardeners' World Magazine (gardenersworld.com)
Do you want to grow any veg or fruit trees? You can buy patio fruit trees which are on dwarf stock and don't grow enormous. Pleached fruit trees can sit almost flat against a fence or wall to maximise space. You rear wall might even grow apricots- depending where in the country you are?
I've bought tulips, daffodils and allium bulbs from aldi, lidl and asda. 2 yrs on, they are all still coming up.
I also keep an eye on the B&M garden centre, supermarket garden sections, B&Q and even regular garden centres. You'll often fine heavily discounted bedding plants. Sometimes they just need a good water!
We have a newly built garden office made with brick and a patio area with very thick oak beams. I was planning on growing a wisteria around the patio part, but also also advised against it. They also advised a climbing rose or clematis instead.
I've been getting bags of free horse manure and keeping them behind the garden office. I plan to let them sit for 6-12mths, then add to the raised beds next year to refresh and add nutrients. BTW- I am a complete amateur gardener, so someone else might correct me and tell me this is wrong 😬