Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
The reason I pick evenings over mornings is because during the night its my free time and I know I can make it for sure whereas mornings its quite unreliable coz I never know when I have to run errands for my parents so that means I might be late/have to leave mid-match all that stuff.
Fine with me. If I don't see you Friday night then it'll have to be Sunday. The hours on Sunday are kinda long coz I don't know for sure when I can play until late Saturday night so 9-12 is just a placeholder in the meantime.