Rents are normally quoted per calendar month, and are payable monthly in advance some landlords require rent to be paid weekly i.e every 4 weeks.
The tenant is usually also responsible for Council Tax, Water Rates, Gas, Electricity and Telephone costs. All rents are payable by standing order or direct debit direct to the agents/landlords bank account.
Please make sure that the rent pay dates that you put down match with your routine at the start or end of the month. Always make allowances few days less/more to accommodate fluctuations in your monetry flow.