By "cold smoke", I mean where the smoke is generated about 20 ft. or so away and cools in a chimney before it gets to the meat. This can take three or four days sometimes, and the meat is preserved by smoke only. Cold smoked meat will keep longer without refrigeration than hot smoked. Different kinds of wood provide different flavors. Alder and cherry are fairly strong flavored. Mesquite and hickory are a little less strong with apple and vine maple providing a more delicate almost sweet flavor to the meat. Almost any hardwood is OK for smoking with. I've even used Mountain Mahogany. Recently I've seen apple, hickory, mesquite and vine maple chips sold for use in a smoker. They're all good. It's a good idea to let the chips soak in water for a couple of hours before using. You can never go wrong by adding pepper and garlic to almost any smoked meat (according to your taste, of course).
One trick I learned a few years ago, with hot or cold smoke, is to place some green grape leaves over the coals which I think gives a great flavor to fish. We made our own ham and bacon from pork and bear meat. We smoked red meat, fish, foul, sausage, and jerky. One time we smoked the meat from six whole deer in our smokehouse at once. "Squaw candy" is fish that's smoked so long that it becomes almost like jerky. I'm told it will keeep forever, but it disapeared so fast, I never had a chance to find out. Another good trick is to smear some honey on the meat before you smoke it. A few years ago I smoked some tuna using an old recipe for vine maple honey-cured salmon. It was smoked fish to die for!
PS - For making jerky out of red meat, always use tender cuts. Grind the tougher stuff up for making sausage with.