Routes

I have an action:

myapp/new

to create a new record in the db. the form calls the create action
which, if validation fails, returns the user to

myapp/create

is there a way to route the user back to myapp/new so they don’t see the
create action?

Also, is there a default route to use for errors? I want to route
(eventually) all errors to an error page.

Thanks!