At 60 inches of wing it is likely to be some flavor of .40 size plane. I would suggest going over to outerzone.co.uk and downloading the manual for a Goldberg Eagle II. The Eagle is a stereotypical .40 size trainer. Even if your airplane isn't a Goldberg it will be close enough for your purposes. There are about a gazillion high wing trainers out there and if you borrowed any of their control throws it will probably work out just fine. The Goldberg is a good choice because of its manual. It gives a lot of good detail and walks you through the process of setting up the airplane. A Sig or Great Planes manual for one of their trainers would probably also work.