A good starting place would be; the ailerons should be set to neutral, which means they should be parallel to the cord of the wing. The cord is a line drawn from the tip of the leading edge, to the middle of the trailing edge of the airfiol section. The type of airfiol makes no real difference. There are cases where the above may not be absolutly true. However, for your purposes this is how I recommend they be set up. Get them as close to neutral as you can and more importantly, get them parallel (equal) to each other.