This looks like an easy to follow tutorial: https://www.buildsomething.com/plans/P0E2E191B803FD3A9/Farmhouse-Outdoor-Glider-Bench
There are lots of rocking chair tutorials here and here. You can take what you need and apply to a bench project.
here is some info
Hi, not sure if you want to make one or buy one. Here is a link to a nice one that may give you some ideas. https://www.wayfair.ca/Latitude-Run--Latitude-Run-Outdoor-Double-Rocking-Chair-With-A-Comfortable-Sling-Fabric-Backing-Steel-Frame-and-Curved-Rocking-Arms-X114357288-L6846-K~C003187945.html?refid=GX421645542362-C003187945&device=c&ptid=915734362269&targetid=pla-915734362269&network=g&ireid=120232349&gclid=EAIaIQobChMI3ev7vqfw6gIVjsDACh1_LAeDEAQYASABEgJ2lvD_BwE