Here are some standard headings for your test strategy or plan:
Objectives
- what are you trying to accomplish.
- set targets, limits, etc.
- these will be used to gauge success later
Testing Granularity
- at what level will you test: module, window, system, etc.
Testing Scope
- which functions will be performance tested
- you may not need to test them all
- define the situations that you will test them under
- will you be simulating high loads (i.e. lots of different users)?
- will you be simulating stress (i.e. lots of requests)
- what is the max test size: e.g. # of queries per minute, number of transactions per hour, number of lines of data retrieved per minute, etc.?
Documenting the results
- how will you be compiling your data?
Remedial Action
- what will you do if you find unacceptable performance?
That's a good start for you.