Magnetic plug on the transmission fill is normal, fill to bottom of threads. The magnet on the fill usually picks up more swarf than the one on the drain plug. I'd just stick to the factory recommendations for oil in the engine, trans and rear until you get a good feel for what you want change.
past afflictions include TR motocars and bikes, R60/2 & a R65, MGs, and a Citroen.
Now a 2012 FF GU and an 87 K75s
dual K&N cones on PVC intake, 40/137.5
$29 VW Hydraulic steering dampener