In the early stages there's various options available to you. It is extremely important that you choose the most suitable style so your document presents as professional as possible. You can select from varying styles including Block Style, Modified Block Style, Semiblock Style. You can have a look at these varying options and select the one that you consider is most suitable.
Of course you may add or subtract items as needed or change the time limits for your particular transaction. This little contract clause may save you from making a huge mistake down the road, so be sure to save this one for future reference!