Many B2B features are just turned on by default, so there's probably not much to review. What sorts of things are you interested in learning more about?
• Customer prices carry through once they are set on the customer record. You just need to make the price level available to the web store search index. Things like volume pricing, credit limits, promotions, customer currency and language and other things ... just work, often with little setup required.
• Many access permissions (eg invoicing) in My Account are determined by the user role assigned to the logged-in user.
• Personalized Catalog Views lets you set up unique/tailored catalogues for your customer segments. If you already have segments and collections set up, then it's just a case of telling NetSuite what mappings you want.
• You can toggle customer/contact-level carts in the website setup record
SuiteCommerce has a lot of strong B2B features, but we mostly focus on the 'B2C' stuff because the 'shopping' aspect of operating web store is most likely to be new to our customers. Eg, commerce categories are a SuiteCommerce-specific thing, that will need to be set up.