Hello Tamara,
This video is not for 2.0 but most screens are valid for 2.0.
Firstly, Install Java System and Import Secure Login Server as Add-On.
Apply Post Install Steps for NW Java.
Then Initialize SL (http://host:port/slac) according to Implementation Guide.
ABAP and Java Configurations can be done according to the videos.
Yes, Only 1 Secure Login Server is enough for all SAP ABAP and Java systems.
Regards,
Yuksel AKCINAR