1) Left click and hold over empty space on the map. (It doesn't work if you catch a bush or building.) Drag and drop a box around whatever you want to copy. Release the mouse button. Check that the units you want to copy are highlighted (i.e. slightly darker in colour). Press Ctrl C. (Ctrl X to cut.) Click where you want to paste and press Ctrl V. The units will be dumped nearby. (I'm not sure bedges is right about having to hover over the unit if you want to copy ... you do have to hover if you want to delete something.)
2) This is easy ... so easy I'll have to check exactly how ... back in a mo. Right, double click where you want the waypoint to be. The Waypoint box will appear. In the Waypoint order field, click and hold the left mouse button: now move up and down the list till your new waypoint is in the place you want it. The other waypoints will be adjusted automatically.
3) Fuel in certain vehicles there is no way to tell. Just refuel if you get the chance - fuel stations always work unless the mission author has zapped them - if you feel worried. Injury is easy to tell. If you can stand up, there is nothing much wrong with your legs. If you go to gunsight view (V by default) and everything looks reasonably still, there is nothing wrong with your arms. If you are alive, then there is nothing wrong with your head or body. It is possible to pick up small injuries that have no material impact on your ability to do things, but don't worry about that. It's not worth the trouble and risk of getting healed unless you happen to find yourself next to a medic or ambulance.
4) It does work, but its in seconds, not minutes. There is a also a small delay anyway because groups always pause at waypoints.
5) Hmm ... don't think so. Would be nice though. RTFM.
6) Easy. Scripts in the Editors Depot.
7) The unit is metres. So 200 is 200m, about 650 feet. You can't use "this" though, you have to use the aircraft's name. "This" is just for init fields.
And yes, the best thing to do is ask questions as you think of them. As bedges said, in this case, it is better to put all the questions in one, clear post than cover the whole board with individual questions. What we really don't like is long, rambling, difficult to understand posts with several questions which should really be on different boards. If you do have several questions to put in one post, numbering them as you have done here is highly recommended.