It will be hard to get that room to be perfect. Mixing with headphones can be a good thing, but that doesnt help with vocal recordings.
A big cloud absorber will help some with the acustics. And you could make some moveable absorbers that you could move into the room when you are doing vocals. Set one up behind the microphone and one behind the singer. That will help alot with the sound when recording.
And i highly reccomend the book from Mike Senior that LyinDalai posted.
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