We are a non-Council site, with land rented from the local Church Charity.
Main advice: get a good agreement - in writing & using a lawyer - with your landlord; get a good constitution for the members. And get a good body of people around you to run it. And join NASLG!
It's hard work, because you have to do the lot from letting plots, fixing the plumbing & mending fences, to dealing with neighbours & local community groups and applying for grants, but worth it. Good luck.
PM me if you want any detail.