Module development and code questions

What is the best way to write a module that will add some to check if someone is allowed to access  a page? I see hook_init doesn't work on cached pages. Do I use moduke_load_include

and does it execute the code first before anything else?

Thanks

exactly what i said in the title.I don't know much about drupal but i know im using drupal version 7.Please help!

Well. I want to create a module that adds my-node-type node type with few fields, as well as Ajax to its "add" and "edit" forms.

The fields are a dependee textfield (T), a dependee list (L1), and a dependent list (L2)

The Ajax functionality is as follows: L2 options change based on changes in T and L1.

Hi,

I'm writing a module for Spreedly to work with Commerce 1 (Drupal 7) - technically a payments api that then lets you use and switch between over 100 payments gateways.

Having never done this before, I'm looking for a good (and simple) module to clone and adapt. Do you have any recommendations for which one to choose?

Hi there drupallers, this is Abdullah here, I'm stuck with a problem and hoping a working solution from you.

I am trying to built a multi step sign up form for my drupal 7 site, therefore I followed this article:

http://matthewgrasmick.com/article/building-multistep-registration-form-...

And I have built a module by following this article.

I have a page footer where I am using PHP Code format. Before I added SSL the links used to work as follows: