Most things fall under the customer responsibility unless otherwise stated. If you are working with Adobe consulting, things may be different, but in general, the only portions of the implementation that our teams do are Destination creation and some of the initial setups for an admin user. Also, there is a difference between the setups of Legacy DIL and P&A (Server Side).
For an in-depth discussion around these topics, I'd recommend contacting our sales or support team directly. You can request a demo of our product here. Our support team can be contacted via email@example.com
Did you still need assistance with these questions? If not, does my previous reply provided enough information to mark it as correct? I want to ensure anyone else viewing this thread can quickly find the info they need.
I'm not an AAM expert, but I'll do my best to answer your questions.
1) I'm not sure what this is. Can you give me a link to where you found this?
For the other questions, we allow both customers and their authorized partners to create and modify traits and segments. You'd just need to work out an agreement. I'm not positive on how this process works, but you can likely contact your account manager and they might have details.