I wanted to mention that we already had the arbor and swing up but all the rest we did in one weekend, pretty much in one day.
TIP: We planted our plants and then layed cardboard or black plastic down right on top of the surrounding grass and around the plants and then mulched. I did a spray of roundup around the perimeter afterwards for easier mowing.
Another tip. I wanted to plant some wildflower seeds but couldn't in just the mulch so I got big bags of potting soil, layed them lining the edges of the bed, cut the tops out of the bags and sowed my seeds in them, then mulched around the sides to cover the plastic that was showing. Requires daily watering but it worked.