I suppose any address will do, but don't quote me on that. You will need to provide a contact telephone number for periods when you are required to be contactable by the company.
Standby (reserve) periods are allocated in 28 day blocks, usually 7 fixed days off followed by 21 days of reserve. You can bid for a reserve period or if their are insufficient bidders you may be allocated one based on a points system related to how much reserve you've done and how long you've been in the company. Expect one reserve period every 12-18 months.