Amer,
UISRA* are no longer valid.
You can see this from Masa's above mentioned blog.
In the above blog, your system belongs to Group C.
Now that you have installed Frontend components, you need to search for backend components (those under the column 'Group C OData') based on the applications you want to configure.
As you can see some have separate backend components and some are delivered as part of Ehp. Cases where you have individual backend components you can install them right away. Wherever they are part of Ehps, you need Ehps for those apps.
Example:
All most all applications which have 'UIX01HCM' as front end components have a specific backend components. For 'Approve Timesheets' you need 'SRA010' in backend.
regards
Krishna