Well, I see one big problem right off... you're using morphs to modify a Poser figure, rather than magnets to modify a Sims mesh. The Poser figures are completely incompatible with anything we can import into the game, you need to start with a body.obj extracted from the Sims 2 files. Poser models are way too high-poly to be able to put into the game, and are not formatted in a useable way.
Take a look at
Xenos tutorial over at MTS2, his technique is what I used to get started. My magnets will also be helpful, and should work correctly once you're applying them to a proper Sims mesh. Also if they are turning invisible, it may just be a Display setting in Poser... under Display is a Deformers option, set it to show all and all your magnets should be visible.
I hope that helps to get you started... I know it's daunting in the beginning, but once you get the hang of it, the creation of the shapes is by far the most fun part, in my opinion anyway.