I was a young kid when it came out and after seeing it, I was all in. In my biased opinion Episode IV: A New Hope was the best. I bought (should say my parents bought for me) tons of the Star Wars stuff.
My favorite character was Obi-Wan Kenobi played by Alec Guinness. He also stared, among others, in the movie The Bridge on the River Kwai. I would say that it's a must watch movie too.