Gathering stats - best practices question

 I've read the documentation, but wanted to verify what I *think* I read.

My question is about when and how exactly to use gathering:

exec dbms_stats.gather_schema_stats (‘SYS’);

exec dbms_stats.gather_database_stats (gather_sys=>TRUE);

exec dbms_stats.gather_dictionary_stats;

exec dbms_stats.gather_fixed_objects_stats;

First of all, in what order should the above four statements be run after an upgrade? I recently did an upgrade to 11.2.0.3 from 10.2.0.4, and I read that the GATHER_FIXED_OBJECTS_STATS should ideally be done twice; once during a representative workload after the instance has been brought up after the upgrade, and once a week later, also during a representative (peak) workload. Should all of these other statements also be run again, and if so in what order?