Good questions. I've answered those in my article "Delegating Effectively as a Tech Lead" here: https://betterprogramming.pub/how-to-effectively-delegate-tasks-as-a-technical-leader-b6d634497512

Please give it a read and let me know if you have any questions.

You also might enjoy Paul Graham's essay "Maker's Schedule, Manager's Schedule" when it comes to time management: http://www.paulgraham.com/makersschedule.html

Hope that helps!