Which method should be used to grant access to an unrelated group of users?

Universal Containers is planning to pilot a new application to a small set of sales reps.
What is the optimal way to grant only those sales reps access to the new functionality, while hiding the legacy functionality?

Sales operations at Universal Containers (UC) wants to create list views to filter opportunities for certain geographies.
How should UC hide list views that are not relevant to an individual user since there will be more than 50 list views?

Universal Containers (UC) delivers training in 500 different regions. The UC operations users team manages course setup, scheduling, and trainer setup. The team members work at a regional level and report to an operations manager. The operations manager requested access to edit ALL scheduled courses owned by the operation users team.
How should this be achieved?

Universal Containers implemented Sales Cloud and requested that sales agents have access to products and prices the company sells, and to be able to create opportunities for its customers.
What should the organization-wide defaults be for pricebook?