Fine French Lace is made from 90% cotton with poly added for strength to keep it from breaking during the manufacturing process. Because of this a HOT iron is not recommended when pressing lace. Most lace will have a "heading". These are threads at the top of the lace which can be used to gather the lace. When possible, I like to use the top 2 threads for gathering because it gives better control of the gathers for stitching.
When you are purchasing lace when you don't have a particular project in mind, it is recommended that you buy 3 - 5 yards so you will have a sufficient amount when you find a garment worthy of the lace:)