Your case will come with a couple of fans, those should be sufficient cooling for your needs. You won't need a fan controller unless you want manual control over the case fans. Any cooler you buy will ship with thermal paste, its usually mid tier stuff but its good enough, the difference between average thermal paste and great thermal paste is only about 3C so its not much, the difference between a stock cooler and an after market cooler is usually about 15C.
Can you post a list of the parts you are getting? It will help to confirm if the heatsink will fit in your case and if you should look into additional fans, or swapping the fans for green ones if you want to keep everything that color.