I visited three companies that sell rocks to check prices and gather samples.
This is what we decided to use for the center gravel area. It's called California Gold 3/8" crushed rock.
I need to cover a little bit less than 510 square feet with 2" of California Gold 3/8" crushed rock. I needed 3.15 cubic yards worth of crushed rock according to a gravel calculator. I found a building supply company that sells to contractors but is open to public. I ended up using 82 bags (7/8 cubic yard) bags of crushed rock for the front yard, and 3 tons of 3/4" pea gravel for the side path. My crushed rock was only $4.73 per bag. Note that the side path is going to be packed four inches deep with the pea gravel ($55 per ton). I used half of it on the side path. I plan to use the extra for the backyard later. I bought two rolls of weed block landscape fabric with staples to hold it down. For the edging; I used 4" x 4" pressure treated wood in 8 feet lengths for the straight edges and a flexible plastic edging I found on Amazon for a very reasonable price. Some people said using wood stakes would be cheaper but I decided to give the plastic ones made by the same company a try.
Now I remove the organic top layer which was mostly weeds and a couple of wild mushrooms. I removed about 6" worth of soil just to make sure that I clear all of the roots of the weeds. This took me two weeks. I spent about 40 hours doing it. Then I sprayed weed killer in the gravel area, making sure to stay at least one foot away from the planting areas. Then I pin the weed block landscape fabric down. The company that sold me the gravel was quick to deliver my purchase on the next day after I placed my order. The delivery fee was only $65.
Their fork lift barely fit into my small driveway.
I sprayed the dirt with marking paint where my edgings were going and installed all of the edging first. I finished the gravel path to the side yard first because that was the easiest. My friend Yuho helped me fill the space in with 3/4" pea gravel.
Then the weed block landscape fabric was installed. I got excited and planted some plants in the front corner. Things are starting to look good.
I actually only put 74 bags of the crushed rock down and saved the extra 8 bags in anticipation that it will settle and sink a little bit over time. Done with the crushed rock! Man, that was HARD WORK! But well worth it. :)