Help with finalisation of web site

Instructed an on line web creation company to create a web site for the purpose of sale of Women's clothing and apparel. They have almost completed this but there are certain finer points that they do not do - I believe they are just routine/simple for the most part and probably easy if you know how - but I dont! For example creating social media links for the site; making sure it stays at the top of the listings; up loading photographs of products; adding descriptions of products and generally assisting to get the most out of the site.