Setting up elliptic curve cryptosystems

Ufh, forgot to write this important things about setting up elliptic curve cryptosystems:

  1. How many bits do I need?
  2. How hard do I want to work?
  3. How much time would it take to compute an elliptic curve secret key?
  4. How to pick and choose elliptic curves?

These questions will be considered later, right now I will just make my codes work! 😀