Hiya Cherry
That link that was previously posted is an excellent indicator of what you are entitled to. It is important, also, to check what your Local Housing Allowance is. LHA is the new name for Housing Benefit. Unless you are in council or housing authority (correct me if I am wrong ABs) this LHA will be paid to you directly either every2 weeks or every calendar month. The landlord can request, should you become more than 2 months in arrears, the rent be paid directly to them. You have to make sure that you pay the rent on time but the LHA application will take around 4-6 weeks so if you have the rent up front etc then there should not be a problem.
Hope it works out for you!