Need Some Guidance: Photopost Classifieds Integration

[SpawnedX]

I could really use some pointers on the best way to attack this. I just bought Photopost Classifieds and I have it installed successfully. Here is what I want to do with i:

- I want to have a link on my navigation bar for the classifieds and when it is clicked it opens the classifieds categories in a content management page.
- It shares the same user database as my forums, so now I need to know how to have it so when they are accessed via this page that it auto logs the user in so it seamless.
- It has to be simplified down to just a post an advertisement and basically use a vBulletin new thread control box to post.

I am not looking for someone to write crazy code for me, I really enjoy doing it myself, but I haven't programmed in PHP since 2002-2004 so I am beyond rusty (left the programming field for the financial field). I just need people to guide me into the proper way of attacking this, maybe just small snippets of example code.

Thanks in advance.