These are the main forms you will need for various services:

Billing:
ACH- to set up automatic debits from your checking account
Credit Application- for business customers
Prepayment Form- fill out and mail with check or money order
PayPal Prepayment Form- fill out and submit

DSL Ordering:
DSL Service Agreement- fill out and fax to 313.557.1637
DSL Order Form- fill out and fax to 313.557.1637
Service Level Agreement- for your records
Leapfrog Acceptable Use Policy- for your records
IP Address Request Form- fill out and fax to 313.557.1637

Toll-Free Services:
Application for Toll-Free Access Number- fill out and fax to 313.557.1637