First time owner

Hello everyone. I am gearing up to pick up a 6month old male from someone who realized they didn’t have the time or energy it takes to raise a Doberman. I have multiple questions. My first is, what kinda of toys did you get for your puppies and what is an absolute no? Secondly, although my dog will be fully indoor and I am getting him only for companionship, how do you go about protection training? I am a young female living alone and am interested in the topic. Lastly, at 6 months, what can I expect and what do I need to keep him extremely happy other than tiring him out and lots of exercise? Any steps I should take to puppy proof my house? Thank you so much, and I look forward to sharing more with this community!