Firstly content. Have you set permissions on your page on who can post? If others cant post mesages you cant build an audience but then you have to monitor what poeple post. Pick slowly through all the settings on the admin pages - you will see posting permissions under manage permissions.
The its up to you - fill out all your info - post some pics and stories from your web site, share some links etc
I too have liked you page but what you need to do is to get other people to "share" the page. You can invite people by email, create like buttons, to put on your website. Find every d**n allotment related page on FB and post your page on them!!!https://www.facebook.com/FacebookPages?v=app_7146470109
is a good place to start and there are tons of tutorial vids on youtube..
Best of British and hey - you have 16 likes already!!
I see someone has already posted it to one FB allotment page https://www.facebook.com/groups/107447489292198