You can choose the layout that's closest in shape to the area where the deck will be installed such as rectangle, square, L shape. Keep in mind that articulate cuts for corners, odd shapes, circles are more time and product consuming & will affect the final cost. Construction of the deck may require excavation of the site, deck drainage, new framing depending on the project. Make sure to let the estimating pro know in advance if you're interested in deck or stair railing as this may later on once confirmed, save a lot of time and cost during the construction of the deck.