Good for you, MP.
The first step is the hardest, and everything after that becomes a rediscovery of life itself.
That's sweet, that you're going to dress up the baby for halloween. The kid's going to have a semblance of a normal childhood, and that is a gift that is beyond words, believe me. I can't imagine the joys I'd have in my memory if I was allowed to follow my heart as a child.
Stay close to your sister; you definitely need her now.
ash