Hey people,
I'm a current student at UM SOD so I'll try to answer some of the questions you had posted above:
1) Interviews first start on 9/20 I believe
2) You don't need to have taken Microbio/Soc or anything else before interviewing. Hopefully it's written on your planned courses, but even if it isn't, it's ok. They'll just ask you on the day of the interview when you plan on taking them
3) Sociology thru community college/online is completely ok.
4) They interview a mix of students at all times (in-state vs OOS). You can take a look at their stats for the Class of 2017 to see how many in-state students they interviewed vs OOS. Though I do know that it's about a 60% (in-state) vs 40% (OOS) ratio right now, with a quite a significant number of OOS students being from California
Side note: if you haven't heard anything yet, just be patient, at least until the end of October. Hopefully you'll hear something. Feel free to PM me if you have any specific questions!