First off, DO NOT use ar234 formations, they don't work. Even if you manage to get them airborn, landing them is nearly impossible. (They wont slow down with you, instead they drift out in front untill they explode)
Taking off in a 234 with rato is fairly easy, just wait untill your speed hits about 100mph, hit the rato. At about 130mph, ease back on the stick to get your nose off the ground, you will become airborn a moment later. Climb about a hundred feet, then level out, and use the remaining rato to pick up speed. At about 160, raise your flaps, and continue level untill you hit 250mph, then go onto alt-x and have a nice flight.
Without the rato, it's basicly the same, except you are going to barely get airborn at the end of the runway, and you''re going to be picking up speed just a few feet above the ground. It's easier to takeoff without rato when the runway goes over a cliff, allowing you to dive a bit for speed.