Once you've exported your bills from Lightyear into Netsuite, head over to Transactions > Payables > Enter Bills > List in NetSuite to bring up the list of bill records.
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Here, you'll be able to search or click onto the bill you're looking for and you will be able to see the bill record in detail.

Follow the above and you will be able to view the details of the record including your bill details, descriptions, line amounts, GL codes, Tax codes etc.
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Note: You can also set up some custom fields to send to NetSuite which will need some configuration set up as outlined below.

Once you have exported a document, you can find the attachment on the document.
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In NetSuite, find the document and scroll down to Communication > Files. Expand Files out and you will see the attachment to download.