If you can accommodate only one task in your spiritual routine – make it the chanting of Vishnu Sahasranaamam.
(If you are new to Vishnu Sahasranaamam, start by listening.)
Any time during the day (preferably during dawn or dusk), after bath,
Listen or chant Vishnu Sahasranaamam.
During free time later part of the day, use your growing intuition to research and find your meaning of each definition or name of God.
The version of Vishnu Sahasranaamam recommended by author (for listening or chanting together during your initial practice days) is this: