Before you are charged any fees, the Truth in Lending Act requires that the lenders disclose to you all pertinent terms of the agreement: the APR, payment terms, other charges, and any information about variable interest.
Generally you will receive these disclosures at the same time that you receive an application form and any additional disclosures promptly after. If any of the terms change prior to the loan closing, the lender must return all fees that have been applied, should you choose to back out of the deal.
The finance charge is the total amount paid in exchange for the use of credit, which includes the interest rate, service charges and insurance premiums. The Annual Percentage Rate (APR) is the percentage paid on a yearly basis.