For what it's worth, I used to be an advisory lawyer at a central government department and advising on FOI requests, when the Act had just come into force in 2005, was a part of my job. The bottom line is that I think you're on a loser here, as it seems to me that the FOIA does not apply to the FA. I'll set out reasoning here because I'm sure plenty f others are as qualified to comment on this as I am and can disagree or add to it if they wish.
The FOIA is basically intended to apply (see section 4) to (a) a "body or office was established by any enactment, the Crown prerogative, a government department or a Minister acting in any other way"; and (b) a "body or office are made by the Crown, a Minister or a government department". Such bodies are listed in Schedule 1 to the FOIA (you can find details here:
http://www.foi.gov.uk/yourRights/publicauthorities.htm#schedule1), and the Secretary of State has power to amend that Schedule to add new bodies.
Where those conditions are not met, the SoS can, under section 5, designate a private body as being covered by the FOIA if: "they appear to him to be performing functions of a public nature; or they are carrying out functions under contract with a public authority which would otherwise be up to the authority to provide".
Unless anyone knows better, the FA does not appear in Schedule 1, and as far as I can ascertain has not been designated under section 5. The only football body to which the FOIA applies seems to be the Football Licensing Authority, which appears in Schedule 1.
It's open to any person in theory to try to persuade the SoS to use his/her power under section 4 to amend Schedule 1 or to designate a body as being subject to the FOIA under section 5. Any such attempt seems to me likely to be futile: section 4 clearly doesn't apply to the FA, and my opinion is that you'd struggle to persuade anyone that section 5 does.
Incidentally, even if you did manage to persuade anyone that the FA should be subject to the FOIA, it doesn't mean you can have any information you'd like. There are fairly extensive exemptions, and from my experience of using them, I reckon anyone competent could make a fairly good case for one of them applying to referees reports so that they wouldn't be disclosed anyway.
Finally, for the sake of completeness, as to your question about the form of a request. There's no pro forma. The requirements are that it should be in writing (submission via an electronic medium like fax or email is OK), should state the name of the applicant and give a correspondence address; and should clearly identify the information being requested.