The first form you file is the 470. This form is all about Bidding. This is how you open your bid, list what you are seeking, attach your RFP, and post for all E-rate Eligible Vendors to see for at least 28 days.
Once you have chosen your vendor, you will post a Form 471...to apply for E-rate Funding for your project(s). Here, you list your vendor, project costs, any ineligible items and wait for a funding commitment letter.
Once your project is complete, you will pay your percentage of the project and file your 486, asking USAC to pay their portion.
These forms are all about Invoicing. You can choose for the Vendor to invoice in one of two ways. They can invoice you for only YOUR portion, then THEY file the 472, to get the remainder from USAC.
Or you can choose for the vendor to invoice you the ENTIRE project amount, then YOU file the 474, to get USAC's portion reimbursed to your district.