New here

I am new to this forum . . . I recently purchased a 49cc 2004 Pagsta . . . I am an older returning student that works two jobs to help pay for this excursion . . . the bike has been a life saver with its 60 mpg . . . however the guy I bought it from lied to me! said the bike had never been laid down and that the ruattle in it was 'normal' well I found out differently on both accounts! Right now I have a bike that will start but will not move . . . could surely use some advice . . i have no choice but to fix it myself just can not afford the repair costs . . . i believe the problem is in the drive train . . . Help Please!