FLORIST HELP!! PLease !!!

Please help! I am getting married in November of this year. I do not have a florist yet. I know my colors are fall (yellow, orange, white, and brown)
My MOH is wearing brown. I don't have any other BM. I just need my bo-k and MOH bo-k. About 5-6 boutioners, and 3 corsages. Can someone help with quotes or where to go? When should I start shopping around for florists?

Thanks for your help ladies!!