Recommend rule of thumb is 4 square feet for each hen - so at least 36 square feet for the coop. So something about the size of 4 x 10, or 6 x 6, or 5 x 8. As you have 9 birds, I would prefer a shed type coop. I tried an elevated coop and it was so darn awkward to clean or even reach the back corners, I like a coop I can stand up on.
I would expect this flock to try and roost on top of the little coop you bought. Those coops are pretty nice as a brooder coop when you get chicks.
If you cannot get a bigger coop, what you should do is sell 6 of the birds. 3 birds would fit into that coop you have at least for a while if you do not have real sever winters. Over crowded chickens develop some of the ugliest behaviors you can imagine.
Mrs K
I would expect this flock to try and roost on top of the little coop you bought. Those coops are pretty nice as a brooder coop when you get chicks.
If you cannot get a bigger coop, what you should do is sell 6 of the birds. 3 birds would fit into that coop you have at least for a while if you do not have real sever winters. Over crowded chickens develop some of the ugliest behaviors you can imagine.
Mrs K