Greeting friends!
I am having an issue here.
I have completed all my 2 custom modules (which are using so many class library project dlls in which I have written business logic with linq). That means I havent used the "Provider Model".

Now issue is > When I want to create package of the module > I also need to add those dlls of the class library projects which I created.

Howe would I add those dlls in Package so that when I install the module at fresh dotnetnuke site so that whenever I install the modules - the all dlls referenced corfectly and copied under bin folder. (my class library project dll as well as thirdparty dlls like ComponentOne dll).

Another issue is > Because of third party controls being used > I need to add some line of code in Global.asax.vb file under "App_Code" folder? Is it a good idea or should I find some other solution for this?

And the last issue is > we are using or may change so many skin once after going to production site. In that case, everytime when a skin got changes i need to add the css and images which my custom modules are using in that perticular skin. What can be the best solution for this? I mean > any time I change the skin > I need not to worry about my custom css and images to be referenced in my modules? (should i copy them in default.css stylesheet file?)

any help would be great!

Take a look at the book by Mitchel Sellers on Module Programming. You can also find some other details by Googling around. In particular, there are some blog entries on the DotNetNuke site.