Hand from UKPT Newcastle about 3 months ago:
Very early on - first orbit - both myself and the button have 10k. I am in the BB. Only information is that button is an online qualifier, but this could mean he is good or bad I guess.
Folded round to button who makes it 200 (blinds 25-50).
I call in the BB with

Flop is an encouraging looking

I check and button bets 400. I flat call.
Turn is

I check, button bets 600 and I check raise to 2000. Button instacalls.
River is

(pretty much worst card in the deck)
I check, button bets 2000 again and I pass.
I lose about 3k of my stack in the first orbit.
Thoughts on how I played this hand? Given lack on information should I lead the flop? Is my check-raise one street too late?
He showed his hand after I passed, so I'll fill that in a little later.