All of our Accounts (vendors and customers) were imported in together. We then went through and marked the account type of all of these to "Vendor". 

After clicking and playing around a couple more days I've found the tab called Vendors that allows you to add vendors and then add contacts for that vendor. 

Why are there two options available to store vendors and is there a reason you would choose one over the other?

Is there any good articles or resources you know of for best practice on setting up and implementing a CRM to use it to it's full potential that you know of?