Clear Out the Clutter

My hubby and I are pack rats, we might be raising some too. We keep so much that we don't really need or even use. It has cluttered our house and is just depressing to me. I start to straighten up and get overwhelmed. I have decided to get radical and make a change.
Our family lives in the country with a couple horses, some cows, lots of pretty chickens, also my 3 handsome two legged animals. All these critters make for opportunity for mess and clutter.
I looked on Pinterest for a 30 day clean sweep challenge. I figure I have time to tackle at least one project a day. I found a great one on Clean Mama that looks not only easy but it might me fun.

I think I could also put the nice extras on a local Facebook buying and selling page and make some money to put towards our family budget. Talk about win-win.
Can you think of another area to tackle?