Just cross out whatever the two of you agree to take out. Write in any additions. For instance, if you want a longer notice in your agreement, you can ask the owner to change it to 30 days or cross it out. But be sure you both initial all changes. Some written agreements have rules that cannot be enforced.
Many rental agreements are printed forma available at stationary stores.
Often these forms are out of date because the laws have changed. You will not be bound by any illegal or outdated rules in the agreement you sign. The owner has the right to ask for a number of fees and deposits. And you have the right to a receipt or a written agreement that tells what the money is for and how you can get it back. The owner can ask you to pay the last month's rent before you move in.