Inputfield defining problems

Is there a way of defining a inputfield?

What I want:

  1. inputfield which allows only 1-9,0 characters

  2. you can’t start with “0”

  3. I think I solved by using in the “characters option” “only numerals”. I can’t use a FFF font but only a arial or something like that. So maybe a better solution?

  4. That one I can’t figer out…