Hi im extremely stuck!

i have a peugeot 306 cabriolet with an automatic gearbox

ill get straight to the point

i have put a second hand gear box in the car and a seconhand fluid fly wheel and the recomended oil i can get the car to go forwards or i can get it to go backwards by changing the mechanism in the gear box but im stuck now i dont no what to do i dont no how much oil i have to put in and i also need to no what i need to do next dis the gearbox broke or the fluid fly wheel broke??

does any one no were i can get some information diagrams information

please help im loosing the will to live......

Thank you very much leigh