Run the following commands to create soft links to your home directory. Of course, you can check the setup.sh before you run it. The setup.sh is modularized, you can comment out the modules you don't want to run.
curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh > install.sh
ZSH=$HOME/.config/oh-my-zsh sh install.sh
rm install.shzsh setup.sh