There are many insurance as a landlord you should have:
In Most cases your Lender will require the property to have building insurance prior to settlement.
Content insurance can be attached to the building insurance although good landlord insurance will cover you for content insurance.
Before taking out landlord insurance cover we recommend you find out what the policy cover. As there are some very weak policy around. A good policy should cover these items
You also need to check how much an insurance company will insure you for each of these items