It varies from method to method. You can find the overview of the flow rates in the standard methods here
No, Evotips are only available with C18 material.
The stationary phase of the Evotip is C18.
No, direct infusion is not possible with the Evosep One system.
No, Evosep One methods are optimized using 100% water as solvent A and 100% Acetonitrile as Solvent B (both with 0.1% formic acid, both in LC/MS grade quality).