I am new to this just like you are, but if you're getting 6 pullets I would personally recommend getting a couple different breeds at least. About a month ago I got my first chicks (2 buff orpingtons and 1 silver laced wyandotte), and while the orpingtons are great (you can't go wrong with them from what it seems), I was told that my silver-laced wyandotte would probably be less friendly, more flighty, and louder. However, I have found the complete opposite to be true. My SLW is easily the most friendly, was the first to trust me and eat from my hand, and while she is flighty as far as wanting to perch more often and tries to fly around a bit, she has been wonderful so far. I am glad I got her instead of 3 buff orpington's- plus it's much easier to tell them apart when they don't look the same! I would love to get another Wyandotte (maybe gold) and some Rhode Island Red's.
Also, everyone is right about you wanting more. I was sure 3 would be the perfect amount for me, but now I'm desperately wishing I had built a bigger coop because I already have the itching for more! So keep that in mind when building/buying your coop! Goodluck with your chicks- I'm having a lot of fun with mine!