Everything you need to know about marking out a field for American football can be found here:
Field markings for small sided football
Minimum field markings ( 1st March 2022):
Field and game management audits
In even-numbered years, BAFRA officials conduct an audit of field markings at every game:
In odd-numbered years, BAFRA officials conduct a similar audit of game management:
Teams are encouraged to self-assess themselves using the forms above in order to highlight problem areas that they may be able to address.
Advice for groundsmen