is it ok to mix mix light wood with thd light?

I assume that you are asking if it's okay to mix light wood with the dark wood? Different stains of wood can be mixed, however - I think it's easier for a non pro to mix painted wood and stained wood.

I wouldn't purchase a matching bed and nightstands. I would do use an upholstered bed instead of stained wood or painted wood.

Your room is quite cluttered - it would be better if you cleared everything out .- except for furniture. Also, please list any pieces of furniture that is staying.

Add a few inspiration photos in a separate comment below + new photos of the room once the above has been done. Include the list of what needs to stay in the new comment.

Thanks!!