Getting the search box to show + other things

We’re considering using Google Custom Search for our searching needs of users, but not sure how to get the search box to show up. Any wisdom? The installation guide didn’t cover this.

Here’s a screenshot of my config:

Also, we have search engine indexing turned off until launch. Wouldn’t want any duplicate content SEO penalties to hit us. Will we still be able to test out the search before launching?

I guess what I’m asking is…

“WIth indexing off, will GCS still index us. And if yes, does the indexed content show up in Google’s public SERPs?”

The main reason we’re considering this in the first place is an easier way to index *ALL* content on the site. We have custom post types, custom fields, etc…which makes me think WordPress’ built-in search won’t properly index all content on the website.