Module development and code questions

Sorry about my poor english...

I am trying to add a custom field to a page node. I know that it is possible to define custom nodes using flexinode, but I do not want to use this module. I only need one more field in the default node.

I think that I would create or extend de database in order to store this field, and I would need to extend the page module.

It is possible?

Thanks in advance

Say that I want to create user groups where each class is its own user group. And I each want them to view their own data but not somebody elses. How would I accomplish that? I want each class to read its own announcements, its own forum data, etc etc. Is there something I can do with taxonomy to make that happen? I don't really want to have to build custom modules for everything or hack a bunch of modules to get this accomplished.

Thanks!

Jay

I have a page on my site where I show nodes of a certain category and right now they're in order of date. Is there a way to make them in order of their weight and add a weight (like with blocks) to each node? Does that make sense?

I already have a form that I was using to suscribe to a newsletter (using webform module) and I read in the simplenews features that you can suscribe
"to the newsletters is managed through blocks, and/or a subscription form, and/or a custom page" but I can't find how to connect them... :-\

Is there a setting or a way to add an edit field for "Full Name" when suscribing to the newsletter?.. OR how can I use the webform I already have?

Thanks!

Just curious are there any functions or variables to get the Drupal's version in place? This could be very useful when people try to develop a version-independent module.

Has anyone been able to, or will we soon be able to implement the stock and stock.api module into 4.7?