Leave: a period of time when you are allowed to be away from work for a holiday/vacation or for a special reason 假期;休假
to take a month's paid/unpaid leave 带薪╱不带薪休假一个月
soldiers home on leave 回家休假的士兵
to be on maternity/study leave 休产假;脱产进修
How much annual leave do you get? 你们的年假有多长?

Fortnightly: happening once a fortnight 两星期一次的(英式英语)

How often does the magazine come out?

Come out就是指刊物,书籍等的发行.
When is her new novel coming out? 她的新小说何时出版?

Do you have any order forms here so that I can get a subscription to the magazine?

Order form:订货单,订购单
订阅某物,可以说是get a subscription to sth,千万要记得在杂志前的词是to, 也可以说是"take out a subscription to sth".
取消订阅就是"cancel your subscription",续订"renew your subscription".