That's great!
You can 'open up' the new room and make it look bigger by putting into storage the 'extras' that you won't be working on. Make it really cute and inviting (not really your work room now).
Separate things and label the boxes well so if you do need something you can find it easily.
I've heard it said that when you put YOUR house up for sale you should no longer consider it YOUR house but a house you want to SELL!
I think that room will be the 'bonus room' of the sale! What crafter (male or female) wouldn't want Their Own Room!
Good luck on the sale.