Do you mean you actually will be checking to see that the bank's existing policies and procedures require the correct documents and disclosures
or
will you be checking loans against existing bank policies, procedures and checklists?
Two very different things and in both, it is odd that the bank would charge you with that given your own stated lack of experience.
In either case, there are loan documentation courses, consumer, mortgage, commercial that can be taken via state banking associations, training organizations, etc. A local law firm can probably help with the note, security agreement, etc requirements.
There are also firms that can help you get such a program set up, including correct disclosures, and then the bank can run it.
It is a big task to undertake, especially when you are starting with little knowledge.