Most of those issues are covered in the tech info area. When you change the trans pan gasket do the filter at the same time. The kits generally come with a filter and gasket. You will need about 7 quarts of fluid. make sure you get the right kind for you make of car.
The SC coupler is also covered in tech info. You can get the SC snout oil from ZZ performance or Intense racing. About $7 for 8oz, that'* what you will need. Or you can use Mobil1 synth.
You will need to locate the exhaust leak and then deal with it. Eight the manifold gasket, donut gasket, or flange gasket. These will all be hard to deal with as the studs will most likely break. Use lots of penetrating oil.
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