This step sounds silly but it really is essential. I draw a map of my classroom and then start marking where each bulletin board is located. This allows me to see the whole picture and then start placing borders and sayings for each board. It's important when laying out your decor that you don't put butcher paper or fabric that look terrible together. This also includes borders as well. I've tried to keep the same color paper or fabric on all boards in my classroom to make the boards match and look great together. My monster theme classroom had black backgrounds but different color borders that were all coordinating.
Don't be afraid of making a creative and beautiful learning space for your students. You deserve a bright and cheerful place to go to work each day and the students will learn better with an organized and creative environment to learn and grow in this year!