Maternity Leave

August 3rd my boyfriend and I are expecting our first baby. With babies comes maternity leave. I spent my whole Saturday pinteresting how to get ready for a long term sub but I still don't feel 100% confident. Right now I am just thinking I will plan out every minute of my days (ugh) and make my lessons that way? I'm not sure and would love some advice! Also, I am due August 3rd, we return back August 25th...what would a reasonable date be to return? I'm so lost! First time mom syndrome :) Thanks!