Even though you were not flying a "scale" plane. I have found this to be a great article...
http://www.modelairplanenews.com/Med...r/flaps.pdf
I'm one of those people who reads instructions [laugh], so I like to review articles like this and fly the suggested practice. I fly some scale and also have a sport plane with flaps - This article has worked great for me.
And - that is a great looking plane. I would definitely try and rebuild her and enjoy flying with flaps
OK, my link was not working - I put the script from what Google pulled up when I typed in my search "How To - Flying with Flaps."