How should I fit my engineered wood in my loft bedroom?

You should choose a sound proof, thermal underlay, and lay this first, over a clean. dry flat subfloor. Let the wood floor acclimatise in the room for a few days before fitting. Lay the floor along the longest wall. Make sure you measure the width of the room and divide by the width of a board to ensure you don't have a run of skinny boards. You can add a little glue into the groove for a more stable floor.

If it’s click use silent walk underlay if not click glue down