Realistically, your folder's file structure can look almost however you want, but naming conventions (at least in v7) would look something like this:

my_custom_module/
    wizard/
        __init__.py
        res_partner_batch_parent.py
        res_partner_batch_parent_view.xml
    __init__.py
    __openerp__.py
    res_partner.py
    res_partner_view.xml

As long as your __init__.py files are all importing folders and files properly and your __openerp__.py file has the proper file structure to import all XML/CSV/CSS/JS/etc files, you should be fine.

my_custom_module/__init__.py:

import res_partner
import wizard

my_custom_module/wizard/__init__.py:

import res_partner_batch_parent 

You could technically have a wizard folder named "asdf" and your wizard Python file named "qwerty.py" and be perfectly fine as long as __init__.py is accurate, but it's terrible naming convention.