Welcoem Mel, I am not single but I have been there with 1 child and know how hard it is sometimes. I was lucky I guess you could say in that XH vanished and we haven't seen him since so no custody battles. DD regards my DH as her dad and it has worked out well. (After a lot of tetehing problems)
Does your XH live close enough to your DDs school to get her there on time etc?? Who is taking her on the first day? (Sorry this is the kindergarten teacher in me coming out LOL)