For the ham, if possible use one of those great spanish hams (Jamon Iberico).
If you are worry about turning tortilla upside down, leave it on the first side, still covered, 5 minutes off the heat to finish cooking top.
There are infinite ways of filling tortillas, from this recipe let your imagination guide you. Don't hesitate, when they're in season, to use spring onions.
And to drink?
A spanish wine of course!
If you can, try "Villa Narcisa", a great red wine from Javier Sanz, wine maker in Valladolid (Spain), or "Orden Tercera", also from Javier (contact www.jsviticultor.com).