How much are my 1977 star wars figures worth?

I have 12 orig star wars figures still in box from 1977 and I can not seem to find an online price guide to tell me how much they are worth. The figures are Sand People figure, C-3po , Death Squad Commander, Han Solo, Chewbaca, Princess leia, Luke Skywalker, R2-D2, Darth Vader, Obi-Wan kenobi, Storm Trooper, and Jawa figure. On the back of one the cards it shows all 12 as a set and are mint in box