Each pleat or fold needs a dowel to support the fabric from behind and pockets need to be made from lining to cover them. Rings are then sewn to these pockets to support the blind on the wires. If possible, cut these strips from the length of the fabric rather than across the width as the weave is tighter and the pockets will wear better. Cut as many strips as you have marked sewing lines on your blind. Fold strip in half width ways and pin the open edges together.
Machine sew one side and along the length.
Thread up the sewing machine with threads to match both the top fabric and lining and check the tension. Do this by testing the machine with two different coloured threads, one colour on the top and with bobbin threaded up with second colour. Make sure that only one colour shows from front of fabric, with second colour only showing on back. Alter tension accordingly. It is always worth using a new sewing machine needle.