"prepare a plan for" is correct and usable in written English.
You can use this expression whenever you need to suggest the creation of a plan for a particular purpose or a particular goal. For example, "We need to prepare a plan for the upcoming campaign in order to ensure its success."
The council has until Feb. 7 to prepare a plan for rebuilding Amtrak.
"Senior military officials have to prepare a plan for a special emergency situation when the U.S. Army moves away".
"Now, if you're playing bad, that just gives Bill time to scream and holler, then prepare a plan for the second half".
Legislation passed in 1997 calls for it to break even by the end of 2002 or prepare a plan for its own liquidation.
When Congress decided to build a federal capital on the Potomac River, President George Washington hired L'Enfant in 1791 to prepare a plan for it.
Dr. Burrows appointed a Building Subcommittee to study projected enrollment and space requirements and to prepare a plan for a new building.
The outgoing city council prepared a plan for the area that rejected the idea of additional housing.
Mr. Abernethy prepared a plan for this apron, but the resident engineer and the author could not agree as to the method of construction.
Staring at the prospect of an imminent Mexican default that could have sunk some big American banks, Nicholas Brady, the newly minted Treasury secretary, prepared a plan for banks to reduce Mexico's debts on a "voluntary" basis instead.
The Department of Defense prepared a plan for a United States military operation so big that it was dismissed as politically untenable; meanwhile, General Hugh Shelton, the chairman of the Joint Chiefs of Staff, concluded that, without better intelligence, a smaller-scale attack would be too risky.
She truncates her home-town visit and dashes back to Romania to return to work, where she's preparing a plan for an oil company to outsource labor and throw employees out of work.
