Measure the wall space along the walls. Figure out the total length of sofa pieces that will fit. Plan to purchase various sections to provide at least two sections that include a sofa back. Buy armless or backless sections to fit into the mix that will provide added seating.
Go over fabric choices for sectional sofa pieces. Look at all-leather sections or fancier brocade-covered pieces. Choose a fabric or covering to fit the room's décor and the color needed. Select the sofa material based on the type of use it will get. Choose vinyl that looks like leather for a sunroom, for example, since sunshine will deteriorate real leather quickly.
Shop for the right style. Look for deep-burgundy leather pieces with ornate wood trim around the bottom as one option. Go over options for beige linen-look pieces with hidden legs as another choice. Visit a furniture showroom to see what choices are available for custom ordering, too.
Draw sectional pieces in various combinations once you have chosen a design. Use two longer sections, both having backs on them, to meet in the corner of a room. Add armless sections on each side to flank each section with a back, for example. Arrange the sectional pieces on paper to form an L-shaped seating group that faces into a room's corner as another choice. Place a tall TV cabinet at a diagonal across the corner facing the seating group.
Use throw pillows and accessories to change the sectional sofa. Buy lots of lime green pillows and leopard-print pillows for a beige sofa group. Add a leopard-print throw to add visual interest. Buy a couple of dark walnut end tables with chrome lamps to tie all pieces together. Use the dark walnut tables to match the dark brown background of the leopard-print throw and leopard-print pillows. Change sofa pillows at some point to create a new color scheme.