You can obtain information from the Senate Veterans Affairs Committee page at
https://veterans.senate.gov/

At that page, click on the tab that says “VA Benefits Claims Process.” That provides information on the process itself, as well as information about the Senators who serve on the Veterans Affairs Committee and how to contact them for assistance.

The House of Representatives Veterans Affairs Committee page also includes a great deal of information about VA, benefits available, and how to get help with your claim. That page can be accessed at
https://veterans.house.gov/