First, welcome to the forums.
Second, do not post your messages in blue. Unless you're color blind, did you not notice that blue on a dark background looks awful? I took the liberty of fixing this little mistake.
Now for you questions.
1. To play fan levels, you need to perform a haddrive install.
This post will show you how.
Or,
read the Trespasser Primer, which contains instructions for performing a harddrive install, plus instructions for install the ATX patch, and links for important trouble-shooting posts on the forum.
2. Do you mean that the frontpage is not formatted correctly? Simply click your browsers refresh button; it's an error with the previous cache. There's the TresCom Dinosaur Download Center, which is your best bet as a repocitory for new dinosaur models; unfortunately, I can't find the link.
3. machf released a new level called "the armory," which included many new weapons.
http://files.filefront.com/Armoryzip/;8 ... einfo.html
4. ATX can disable the code that prevents dinos from entering buildings (although beware that physic-glitches will probably ensue).