I will like to know how to compute a dynamic forecast from maximum likelihood estimation. For example, If I estimated a ad-hoc GARCH model as follows 

series e=inf - beta1-beta2*inf(-1)

series h=var(e)

series h=alpha+theta*e(-1)^n

So how would I forecast dynamically variable "inf" and "h". I would appreciate if you can share a loop code for this. 

Thanks

Timmy J.O