The nearest train station to Ewood Park is Mill Hill, just walk down the hill after exiting station and there's Ewood!
This station is on the Blackpool SOUTH to Colne line only. Trains leave Blackpool South at 44mins past the hour and arrive at Mill Hill at 43mins past the hour. All trains go via Preston, eg dept B'pool South 15:44>Preston 16:22>arrive Mill Hill 16:43 (hope that's not too confusing)

Blackburn station is quite a (depressing)walk to Ewood Park, about 30 mins, a few boozers on the way but none I would go in!

Trains back to Blackpool/Preston are the 22:27 from Mill Hill to Blackpool South, arrive 23:28 or the 22:24 to Blackpool NORTH, arrive 23:48. All trains stop at Preston

Hope this helps