Photography Contract

I'm a new photographer about to sell photos for the first time, and friends have told me I should look into some kind of legal contract to protect my work and income. I've searched the internet for free sample contracts without much luck. I'm looking for something that would apply to a wide array of photographs, from portrait shoots to landscape & nature photos, as well as photographs taken on - or of - the client's own property. Where might I find this type of contract?