Hello & welcome to chaz. You have plenty of time to look up plenty of training sites, the most important thing is to socialise from the day you bring a new pup home.
That is so sad for you. I know exactly what you're feeling, only I had a good outcome. Back in about '97 April was also poisoned. She spent 3 days in hospital on a drip b4 she improved & came home. I had almost 15 wonderful years with her.
I hope you can bring yourself to bring another dog into...
In the early 80's we adopted a 5 1/2 mth old dog from the RSPCA. We were told to bring him back in 2 weeks to have him neutered, which we did. Now-a-days because of ppl not bringing their pets back for spay/neutering the shelters s/n 7 week old puppies which is way too young to be done.