questions about custom challenges

Games Other Halo
1
  1. does it count towards the credit cap?
  2. can you still get the custom challenges if u are credit caped?
  3. do u need to let the challenge expire before you get ur credits?
    plz someone help me im really annoyed
2

Yes.
No.
No, you can turn them in and get them instantly and then you can create more challenges.