Dont feed till week 3 starts, any soil has more than your plant needs for first days.
As for watering , take same cup, put soil , weight it up. Now you know dryish pot weight. When its close to that - time to water.
Dont forget to spray her often, but be aware if you have strong light, dimm it up or put further away. Plant dont need loads of light for first two weeks.
Dont let it dry too much , later sometimes its even good stress technique, but for first two weeks till no root system is developed - bad.
Pour water not on stemp and make mini circle around , as plant grows - increase it. That way root will run after water instead of just going down and making early root bound.
When plant will be bigger only weight of pot will tell you when to water, never let your plant remind you that !
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