Rare Pair Fest

I've never done an exchange before, so I'm incredibly excited to be participating in my first one! Just a couple of etiquette questions:

1. Is it bad if my 'wanting' and 'offering' pages look similar (same fandoms/pairings)?

2. How much detail do people want regarding descriptions? I have some basic DNWs because I love the surprises that can come out of giving people creative freedom. However, I'd hate someone who got me to go 'Screw this, she gave me nothing to work with!' What is the general consensus?

Thank you!