Hello there

A few months ago I started a wolrdbuilding project. For this project I recently decided to make a few creatures that do not exist on earth (though most creature of that procet are identical to earth). It is not many, but since I want to keep most of my project as realistic as possible I feel the need to actually evolve those clades and not just say "oh yeah and we got those". And I got a few questions (mostly because I have spent some time trying to find the answer without any good results).

1: are there a few good guides or introductions to spec evo that might be helpful for a beginner?
2: is there like a wiki about what adaptations are good for what or what is common among animals that fill the same niche?
3: how do you all write information about the creatures down?

Thank you for reading and for asnwering