Looking for garden help- more hardscape than landscape- but any recs welcome

We are looking for some help with our backyard garden, about 20×25 in size.  We can handle the planting part, but really need help figuring out the hardscape- adding stone patio space and path, stone or block retaining walls for planters, etc. We are on a budget and can do some work ourselves, but figuring out best setup is really key- we want to do it once and be happy with it for a long time. Any recs welcome!