So sorry to hear about this, personally, if I were in your shoes I would call any breeder of any breed by me and ask for a little help. I can't imagine, given your story and situation, they wouldn't be willing to at least walk you through some of this.
Don't have anything more helpful, I'm sure some breeders will chime in. My condolences for losing your brother. I hope someone can help you through this. If you give your general location some around here might be able to help you find someone.
"An excess of size is an unserviceable feature for breeding, his powers of endurance, his speed and the smartness of his movements suffer in all circumstances. Giants are never nimble."-Creator of GSD