Indexed Pages Localization

Hey guys, question..

I have a site domain.co which is in Hebrew and all traffic is in Hebrew with about 400K indexed pages.
We're planning to expand to the US, so we thought of making domain.co/he for Hebrew and domain.co/en for English. Currently there's only domain.co.

I'm afraid it'll screw up all our indexed pages and future indexing of english vs hebrew version.
I know the rel alternate way, but how would it affect indexing of new pages? most of the pages are dynamic and it shouldn't have the same page for both languages.

What's the best way to go around it? Any tips? Experience?

Thanks

You can use multi-language wordpress plugin.

Akau first look at the seller, but currently not visible here

Jobdollarr said:

You can use multi-language wordpress plugin.

Akau first look at the seller, but currently not visible here

Click to expand...

Thanks for the quick reply! I'm not using wordpress, it's a custom made website.

You need a developer to it, so you would like paypal website.

They detect all languages via ip

I'm a developer I just don't know what's the best practice in terms of seo.