I moved into my a new build a year ago. The garden is approx 50ft wide and 40ft deep. N/NW facing and heavy clay soil with a slight slope downwards away from the house on the bottom right hand side.
The developers laid turf and I instructed them to leave a 1m wide border along both sides and the bottom (a hasty decision, mainly to make mowing easier).
I have since planted 3 small trees along the bottom boundry (Hawthorn/Plum Cherry/Crab Apple) and planted a mixture of shrubs and perennials in the borders, although large gaps remain. Mainly because I can't decide what to put there!
However, I think we need to chage the shape of the borders to make it more visually interesting and/or add some sort of feature to give the garden some height. I also don't know how best to deal with the slope!
I am a keen (fair weather) gardener and like a fairly traditional look with maybe a slightly contemporary edge. My other half is fairly competent with DIY but we don't have a big budget.