Hey everyone so tomorrow I'm getting Brandy fixed.... This is the first time I have a dog this little fixed... I had a pit and it was different because he was big.. can anyone help with advise for preping for it and after it.. I know she's going to be in a econe.. but I forgot for how long.. and the rules.. HELP

My nerves are getting the best of me that I feel like to cancel..
Ok let me start again.. I need help with preping for her..
what are the steps I should do.. I gave her a good bath today and cleaned her bed with clorox and let it air out.. and cleaned with water and baby soap. Cleaned her linen.. brushed her teeth..
Should I feed her the in the morning?
how long will she be down and out?
will she be in lots of pain? if so can I give her anything for it? and if so what?
what's the best care for the wound?
and will the econe hurt her?
I'm so lost I just want the best for my baby.. Again. please help