Create a Vendor (Your Supplier)
Relations->Vendors->Add New Vendor
Enter Vendor Name -> Account, Email, Phone Number are for your records to track. -> Click Save
Click on Address -> Click Blue square with + on the right to add address.
Pop Up Window add Company Name and address- You need a shipping address and billing address->Default will use the same address for both. Not real important unless you want to track.
Repeat for all your vendors.