This is very similar to me.
If you want to learn it VERY quick, take an MSP-teacher for a week and
create a very complex project plan TOGETHER. Then you will know how it
works. But this is the most expensive approach i can imagine.
Otherwise just buy a book, read this NG and create your projectplan
step-by-step.
AND: forget that MSP should help you in the first weeks! It will just
cause you trouble until you understand how it works, how it calculates
efforts and until you generate your first report. If you really put much
effort in it, it will start helping you after a while.
greets, Felix (since 4 years with MSP and still many questions