carreer start

hi i am looking into the it field to start a career. i am very knowledgeable about computers and the o/s systems that windows has. i have looked into the microsoft certs. and found the one that i want(mcdst) but the programs and test are way to expensive for me ant this time. does anyone know where i can get free or next to nothing training in this field? my goal is to work for microsoft(dream).