Each warning above references a specific EnergyPlus object type, e.g. SimulationControl. The Input Output Reference for that object type should give you enough information to better understand the warning. For these particular warnings:

1. warnings . . . 1. You've requested that sizing periods be simulated, but there are no sizing periods in the file. Can be ignored.
2. ignored. 2. You've turned on the zone sizing calculation, but there are no sizing objects present. Can be ignored.
3. ignored. 3. You've omitted the schedule type in some schedule objects, so they will not be validated. Can be ignored.