Savannah here from the Shopify Guru Team. :)
There's a wide variety of wholesale apps in our app store that can help you put your plan into action. Choosing one depends on how extensive you need the features of each app to be.
If you're just looking to offer special prices or products to your wholesale customers, I'd recommend checking into an app called Locksmith which will allow you to require customer login for wholesale customers. You can tag customers in your admin to select which ones will be allowed to view wholesale products and prices.
If you're looking for more robust wholesale capabilities (like net-30 payment terms or volume discounts), you may want to check out Wholesale Pricing by Supple.
Take a look, and let me know if there's anything I can clarify!
Savannah | Shopify Guru