Any lease that extends for a year or more must be in writing and signed by the party to be charged (you). Otherwise it is not binding and you cannot be charged for it. This requirement stems from the common law Statute of Frauds.
Even if you did sign a lease, and subsequently broke it, the landlord must make attempts to mitigate damages. This means they must treat the empty space just like any of their other empty units and make all attempts to rent it to another party. For example, if you signed a one year lease but never moved in, and somebody else rented the unit two months later, you would only be liable for those two months that it sat empty.