Always check the colour of the extensions with your natural shade. One shade darker is not a problem however a lighter shade will look odd and stand out. Ask the shop whether you can style your extensions with hot tongs or hair dryers. Most human hair wigs allow for re-styling.
Wigs are pretty common and come in synthetic hair as well as natural. The way they are made can vary from wig to wig. Check to see which will suit you. Online shops will provide detailed information about the way the base is made and woven.
There are different kinds of wigs available like hair pieces, wedding wigs, synthetic lace wigs, hand tied wigs or monofilament wigs. Monofilament wigs are unique. These are high quality in which the hair is woven into a thin mesh like fabric. It looks a lot like skin at the base on the hair and hence gives a very natural look.