The USPTO fee schedule lists the current fee rates for applications, including filing fees, excess claims fees, search fees, issue fees, etc.. Patent fees that are reduced upon establishing a small or micro entity status are also listed. The USPTO’s accepted payment methods for fee payment can be found here.
The Inventor Assistance Center is a great resource to answer general questions regarding patent examining policy and procedures. They can be reached at (571) 272-1000.
For MyUSPTO customer support, call 1-800-786-9199(toll-free) or email servicedesk@uspto.gov.