This is being over-complicated: water every two or three days (at first, when plants are small - more often when the are larger..,.duh!). Do not rely on schedules, finger tests, just use your common sense. If the pot is very light and the soil looks bone dry, it's time to water. Do so until excess water drips out slowly from the pot holes - you may have to add several liters to saturate the soil before the excess stops quickly poring out. To clarify, when very dry, if your soil-mix has the proper consistency, the first few liters of water should drop right through the entire pot. You need to saturate the roots, but not drown them.
If the plants are happy, the pot feels heavier than when bone dry, do not water.
The biggest newbie problem is over-watering. If in doubt, DON'T!