CommanderXeph

I know how to open pk3's and got the JKA SDK.

That's something. So is there a frankenstein-ing tutorial anywhere?

It depends what areas interest you. If bringing new characters to the game is your thing, then skinning is the place to start.

Kitbashing/frankensteining would be the next step up, as it is so easy these days with Blender and mrwonko's plugins - and you'll learn so much just from practicing and running into problems along the way.

http://jkhub.org/tutorials/article/195-blender-jka-frankenstein-modelling/

Feel free to take a look at the other sections:

http://jkhub.org/tutorials/category/1-coding/

http://jkhub.org/tutorials/category/13-modelling/

http://jkhub.org/tutorials/category/7-skinning/

http://jkhub.org/tutorials/category/11-mapping/