Module development and code questions

I've got a tool that I'd need to integrate with Drupal, so it's moduling time - oh noes :o

First thing that comes on my mind is how can I get the Drupal installation to find the content added with this new module? I know the answer: "By implementing the hook_search", but that doesn't really say anything usefull since I'm all new to this hook-system and how to do it.
I've searched thru for example CCK-module and I can't find anything related to search_hook there either, but it saves its information to custom tables in DB and search module finds that data too - no idea how.

I am having issues with my acidfree module not displaying the thumbnails at all times.. I find that I have to click on the slideshow tab and then return to the view tab (sometimes multiple times) before the images return. Not only do the images not appear, but the buttons cannot be clicked on... In the slideshow tab, I get this message "If you can see this, then your browser cannot display the slideshow text."

Any ideas?

I just installed Drupal for the first time and I can't get any modules to work. I've loaded, set access, settings, etc. to Img_assist, Fck_editor, TinyMCE, ImgMCE and none of them, no matter what I seem to do, will show up.

I'm on an iMac with Firefox and Opera and my java is working fine. I've followed the instructions on all of the modules over and over, set and reset everything, and still no joy. I even created a new account on my Mac and signed in just to see if it was something to do with compatibility.

I'm having an issue at kallistipress.com, where I've installed drupal and the ecommerce modules suite, but when users try to download files that they've purchased, they get an Access Denied error.

I have store, cart, product, file, tangible, and parcel enabled. (Plus coupon, payment, paypal, shipping, and shipcalc, but I doubt those are involved.)

Since shipcalc isn't completed, I'm hand-enterring transactions via the transactions administration page.

Hello,

I want to have a node that contains for every instance the same link. With the existing module "link" I have to specify for every new node the value of the link.
But that's not what I want.
I also want that the link includes the id of that node-instance.

What do you think, is the best solution for my problem?

Thanx.

Help please!!

I have tried to install both the filemanager and acidfree modules, but cannot seem to get Acid free to work. Whenever I attempt to access the Acid Free content I get the following errors in my error logs "No Acidfree root album found, created new root" and multiple thereof. This is the information that I get on the acidfree/test site...

Acidfree self-test checklist