Pretty simple workflow for beginners,

All control is carried out through the bypass nodes (at the left), for more fine tuning, you can use nodes within groups.

Upscale can be done with or without a model.

Workflow have preset image sizes for mobile 5:8 and desktop 16:9. Control through node "Image Preset"

After T2I image size: mobile - 800x1280 (WXGA), desktop - 1280x720 (720p)

After I2I image size: mobile -1200x1920 (WUXGA), desktop - 1920x1080 (1080p)

After Ultimate SD image size: mobile - 1600x2560(WQXGA), desktop - 2560x1440 (2K)

You can change the type of detailer by changing DetectorProvider.