A detailed budget showing overall cost is vital. If it is an ongoing program, indicate monies received, monies anticipated, and the sources of these funds. And once again, depending upon the recipient of the appeal, make sure you send the correct IRS information, audited financials, and most of us want a listing of board members. My feeling is that if such supplementary material is not specifically asked for, don't send it. If the project is expected to run over a period of years, a projected budget for each year should be submitted.
Many foundations provide funding on a yearly basis only.
Others will provide funding for multiple years. Your research will tell you on what basis to make the approach. Now having said all of this, it more than likely that most of your appeals will be turned down. There are many fine programs and projects being declined. The choices grantmakers must make are difficult.