hi sian,firstly may i welcome you to COL.i warn you now it's very addictive
my advice for an easy transition is to NOT make to much fuss of your new dog.it's gonna be a big shock to her so the more matter of fact you are,the easier it will be for poppy.
i know you will want to cuddle and fuss her but this may be a little daunting for her in the first few days.we took in a lovely cocker last december,she was we think an ex breeding bitch who was dumped on the motorway.we were her third home in 12 months.she had no idea how to play and was very confused bless her.we do have another young cocker who helped millie to play and have fun but we made sure she had no extra fussing and she settled very well.sadly she died suddenly just a few months after we got her.i still miss her nudging me for a cuddle.
it will take poppy a while to settle you may have a honeymoon period lasting a few weeks then when she is feeling secure you may encounter a few problems,nothing major usually it's messing in the house and little things like that.just go back to basics on the training if this happens.
looks like penny beat me to it.take penny's advice sian,she really knows what she is talking about
well done for giving a rescue dog a loving home.the rewards are fantastic when they have settled and look upon you with soooo much love.
good luck and please keep us updated and of course loads of photos