How do I prepare a site for future translation of interface and content, or should I do it now?

I am working on redesigning my website GiveFriendly.com in Drupal 6.8. I enabled the content translation and locale modules, added and enabled the languages French, German and Spanish (none of which I am fluent in) in the Languages module and configured the language negotiation to "path prefix with language fallback". When I look at translated paths for each of these languages though, I only see a few words and phrases in the interface translated and none of the content that I have identified as English (some are listed as "language neutral"). I have a lot to do to get this site ready to go online and I should probably spend more time thinking about how to configure this (Which languages to add and enable? Should I find volunteers to translate content? How should users reach translated pages? etc...). How can I configure my site so that it is easy to translate once I have more time to do that?

Thank you.