Zoo U Course 7: Bits and Bites Building Basics (self-paced tutorial)

Yay! I'm so excited about this! I'm posting while my game is running so it works :)
I just need to know a few things:
1) Do we have to be here at a specific time because I only have time to play The Sims 3 on weekends?
2) If we do have to do this at a specific time then would we be allowed to catch up in a day or two just in case this is on a weekday? If its on a weekend then I probably will be able to do it at an exact time.
3) If we don't have an EP with certain features that we need then do we just improvise?
Thank you :D