Hi
I have just completed a course which had a lot to do with risk assements. generally you will have to write down what equipment you will be using ( ie wfp )and the risks involved (ie electric cable, parked cars, public access, trailing pipes. ) You will then have to write down the control measures you intend to put in place ( ie safety signs and hosepipe ramps.) The risk assement has to be specific to the place of work and should include full address, your contact number, names of employes, phone number of nearsest hospital incase of accident , meeting point for emergency services. A form is the best way of doing this and I have one which suits my business ( chainsaw work ) which involves a lot lot more.
Hope this helps
Justin