Mags don't need to be set manually, they come on automatically when the engine-start is done. Sometimes the throttles have to be advanced a bit, sometimes they don't. Prop-pitch should be at full-forward on the levers (100% fine). Water rads should be 100% open. Oil rads can be left closed, but may need opening a bit once airborne and if flogging the engines. By default select engines by shift-1 and shift-2, hitting i after each to start each engine respectively. Don't switch to 2nd engine too quickly after starting #1 or #1 will not catch. Once airborne bring pitch back to around 85% and throttles back until you have manifold pressure and revs at or behind the furthest-left red markers on the respective dial-edges. You can play with pitch and throttle combos quite extensively but you won't get much more than about 400kmh at sea-level to 1500m (I haven't tried higher). The fuel-cock levers in the cockpit do nothing, fuel is already on by default. Flaps are not needed for take-off, only for landing. Mags need to be manually switched off to stop engines.