getting error in make to order

hi all,

while configureing MAKE TO ORDER i am getting the following errors

1)while saving the sales order it's asking for a g/l account no.

2) after forcefully saving the sales order i have tried to create the production order but getting error "no routing found for materil 787"

kindly help me to solve the the problem, it woul'd be beter if u send me step by step process with all configuration.

kaushik