I would like to design a WordPress theme for a self-hosted website (a business site) w/out taking down their current website (which is NOT wordpress). Meaning, I'd like their current website to remain as is until my theme is ready. Does anyone have tips on where to develop the theme? If I do it at a WordPress.com site, will there be issues for things like plugins and stats? Should I develop the theme at a different domain name that isn't being used for anything right now? Please let me know any tips you may have. I am new to WordPress but very eager to learn more about this awesome platform.