Translation of strings using WPML

Hello,

I am developing a site which will be Spanish(Main Language) and English (Switching using WPML). However your theme is originally in English.

So I am considering two different options:

– Should I develop the site in English(Main Language) translate all strings and pages, and then switch to Spanish as main language. I don`t want to lose all my content

– Can I develop the site in main Language (spanish) and still find the way to translate the strings?. My problem is that if I develop it in Spanish, website will detect that current strings are spanish and they are really English.

Which is the best way of facing this situation?

Thank you