Hello kenan03 and Welcome to the Forum.
As New Member Protocol goes, be sure to check out the
FAQ section and Post an entry in
Member Introduction too.
Does anyone know what the result would be if I chose blue for one selection and green for the other with regards to what the third color would look like?
To answer your question, just did a demo on a different RGB Saber of mine and the 3rd colour will equal Cyan/Light Blue.
There's also a description of the benefits a Hero Tier Saber will give you plus some alternate options in FAQ.