You'll need a membership, and have attended other European games in the past couple of years, as normal. You'll probably also have to register your interest for games in advance.
I know people go on and on and on about Thursday night this and Thursday night that, but football is on every night of the week nowadays, it really shouldn't make any difference what night it's on. As Jürgen said the other day, who cares?
3 home games and then it's the knockouts. Demand for them will be what it usually is.